I just don't see much point. In an urban environment, I'm not going to be screwing/unscrewing the pieces to arrange it into my weapon of choice for the bad guys around the corner. If I felt the need to arm myself, I'd get a gun, staff, cane, or knife, any of which would be cheaper than this staff. If training with a stick, I'd train with my cane or staff, bought or built customized to my liking, and not be switching between them before mastering both.
In the wilderness, same thing. 99% of the time, I'd opt for telescopic trekking poles. Cheaper and lighter. I'm a hiker, so of course I'm biased, but if you put me at a trailhead with 5,000 vertical feet in front me, I'd be thankful to take a light, telescopic trekking pole or two, but would almost certainly ditch any staff half a mile after the terrain gets steep.
It wouldn't suit my needs as a balancing aid, but it does offer other features. It's heavy and stiff - I could beat people or animals with it, whereas I would not try this with a trekking pole. In my time outside, I've needed to be mobile and agile (hands/pack free of heavy staff) more frequently than I've needed a weapon. It's definitely legitimate to want a stout weapon though, so suppose you're one of those people. What makes this staff superior to a wooden one or a home-made metal one made for $15 (95% off this staff's MSRP)?
Well, I suppose it's the additional features:
It has a knife. OK, knives are cool and useful, we all like them here. That's why I already carry a belt knife and a multi-tool. I think everyone here carries at least one dedicated blade. So when are you going to unscrew this knife? When you're taking a break and need to slice your lunch? Probably not, you'd probably use one of the purpose-built knives with comfortable handles and that uses steel and grinds built exactly to your liking, because you've spent so much time learning about them and investing in them. OK, so it's a backup blade.
I'm stranded in the woods and lost my primary knife - it could happen. I personally will have a backup (multi-tool blade at the least) that would serve woodcraft tasks better than the Crawford's longer (more awkward without proper profiling) blade and less of a handle than a SAK or LM. It looks like the blade has a very thin, round handle, which I imagine would be a PITA to use in the bush. It would strain the fingers and the small, cold metal would likely suck to have to keep a strong grip on in cold weather (with or without gloves, just imagine using a 5" blade with a metal pencil for a handle). Furthermore, I'd argue that the pliers, can opener, tweezers or whatever your MT has in it would probably be more useful than the rest of the features of the staff. So if I'm not using this backup blade as a backup blade because I have a better one, what do I use it for?
AS A SPEAR!!!! What's cooler than putting a big blade on a stick and stabbing things?! Not much, but then again what are the chances of this being useful to me in a survival situation? Not much. I like spears as much as the next guy and if in a TEOTWAWKI scenario, using my knife to sharpen a stick would probably be one of the first things I'd do after getting settled down a bit and meeting more basic requirements of water and shelter. But really, are you going to hunt with it? Creep up on animals and stab them? It's possible, and maybe Crawford Staff users are more skilled at this sort of thing than I am, but personally, and for most laymen, the time would probably be much better spent with traps, snares, and more conventional hunting methods. I would prefer sticks and stones for hunting small game than spearing them. Large game or medium game? I'm not going to take on a moose with a staff and thin stainless blade even if I'd managed to sneak up on them. For trapped animals, I'd club them with a stick, not try to skewer them.
OK, so for hunting the spear doesn't do much for me, but I can use it to defend myself, can't I? Well, yes, but it is it worth it? I would be more likely to cut myself walking around with the blade on top than I would be to have some wild animals attack me and need to use it to defend myself. Keep the blade stored inside? OK, sure, but is that cougar going to say "hi I'm going to eat you soon" so that you can get it out and ready yourself to kick to some feline ass? Unlikely. Two-legged predators... a spear would definitely add some security if I know that they're about and presenting a significantly larger threat than usual. However, in this case, I'd prefer to be armed with a real gun of some sort. If there were bad guys out to get me or whom I might run into and I knew this (because otherwise the spear is useless because it's being stored inside the tube), I'd probably be investing my time in escape and evasion (light and mobile = sans staff) or in arming myself appropriately. A spear is effective but not as effective as a gun. Furthermore, is it more effective than a staff? Probably in trained hands, but in untrained hands, I wouldn't be surprised if a solid wooden staff is more effective (more instinctive to use, less chance of freezing up and having your opponent close the gap while you try to align the blade) and presents less chance of getting yourself cut. MERCOP would know more about this than me, but I'm certainly skeptical of the utility of a spear being worth the investment.
Perhaps you've disagreed with me already and if so, go for one! If you're still with me, we have to look at the rest of things it offers before making a decision. That is to say, its blowgun.
I think the blowgun is pretty cool. For those of you who have not used one before, they are very easy to learn and could take small game with less skill than is necessary for throwing stones but more than using a gun. I would have to examine this particular one before making a decision about it, but from the site, the blowgun section appears to be 38" long. In the world of blowguns, volume is everything, and three feet is certainly on the short end. A five foot blowgun would give significantly more penetration power and six or seven feet would be ideal. If you look at people who actually USE blowguns to hunt, you find that they tend to be 5 to 8'. I'm not saying 3' is impotent, but that it's not going to be as effective as blowguns you read about. The darts look positively tiny. I've made blowguns and used them. 8" of coat hanger wire with or without a little razor-blade broadhead in a full-size blowgun is POWERFUL. I'm afraid that these tiny darts (3" max looking at the picture) shot out of 3' of tubing would bounce off thick skin at longer ranges or simply stick into the sides of closer game while they run off to live or die somewhere far away from where that's useful to you; time you've spent dying rather than surviving. This is speculation, if anyone has a penetration test for this blowgun, I'm curious to see it. I suspect it uncomfortably straddles the line between being a toy and being a weapon.
Looking at it some more, it appears as though there's a single foam tube cover for the hand. In the summer, this doesn't matter much, but in the winter, it becomes critical. In cold weather, conduction will rob your hands of heat very rapidly. If the handle can be slid to whatever position you need it to be at and stay there, this isn't a problem - you wouldn't lose heat faster than with any other staff. If it isn't programmable or doesn't stay where you put it, however, and you end up frequently holding the metal, that could be a recipe for frostbite. As someone who has been cold, I can tell you it's F'ing Scary. Not being able to fix a lace on your shoe or pack because your fingers aren't working properly is a bad situation getting worse. I don't know whether this is a problem with the staff or not: I'd have to try it out, but if it is, I'd end up wrapping it in spare fabric or else ditching it in some cold-weather survival situations. For $300, I don't think I should have to be making modifications like that.
From what I see on the website, The Crawfords look like decent people making a high-quality product that people are willing to buy. It's novel, it's probably a lot of fun to own and play with, but at the end of the day, I suspect it wouldn't get out of the closet much.
If you're looking at the staff and think it's the coolest thing you've ever seen, you'd probably be happy with your purchase. If you have a budget and plan on actually using it, I'd strongly consider what you're buying and look at alternative options.