My smiths sharpener was delivered today, so I ran home for lunch to test it out.
First impression- its smaller than I expected, which is a good thing. I don't have a worksharp to compare it to, but the size is convenient when it comes to storage. The instruction manual is pretty limited. Doesn't even really say anything about charging, just notes the charging hole... It came charged up, which is good, so I was able to try it. I also plugged it in and can confirm what cbwx34 wrote above that it does not work when plugged in
I had only the included belts. I ordered some finer grit belts (800 to 5000) from Amazon, but they won't be here until Monday. So I installed the included fine grit (600) belt to try it out. For my test, I used a cheap harbor freight folding knife and I sliced it up several times against a rock to dull the blade before sharpening.
Issue: the sharpened edge of the knife blade goes all the way to the end of the blade, and the knife has thumb studs. Which means that there is a cm or so of blade at the back that does not get sharpened when using the guides, because the thumb studs prevent the knife from going all they way to the belt. Not an issue for all knives, but would be for some. You can get around it by removing the blade guides, but that means you are freehanding it on the belts. I imagine that may be an issue for some beginners. I believe you would have the same issue with the worksharp.
Just looking at some of my other knives, I don't think I would have this problem with my Spyderco delica's or enduras, , but would have the issue with my benchmade mini-grip. It just depend on the knife, how far back the edge of the blade goes, and whether or not it has thumb studs. Like I said earlier, removing the guide will allow you to free hand sharpen against the belt so that you can sharpen the entire blade.
That said, a few passes on each side, and a few passes on my leather strop and I was able to get the cheap harbor freight knife to easily cut hairs on my arm. Not bad. But, it did remove a decent amount of metal, IMO. Part of that could be user error, and maybe also the grit of the belt I was using. I imagine (hope) that I would remove less metal with the 5000 grit, and as I also get used to the sharpener.
So that's it. I had to get back to the office, so will have to do more testing tonight. It seems pretty OK, but I don't know how often I would really use it. I generally keep my knives in pretty sharp condition, and don't let them get too dull. I do touch ups on my Sharpmaker usually. I've also been trying some freehand with an Artic Fox double sided field stone. I can see this sharpener being useful for really dull knives, but for me that probably means it will get limited use. I'm thinking about possibly returning it, but on the other hand, I suppose it could come in handy for the occasional use. I think after more testing I will have a better handle on it.
Hope this helps.