Initial reaction: positive, with some reservations. Can't honestly recommend something until I've tried a bit more, will add details and a couple pics when I can.
Short version: didn't even read directions (I hate directions
and enjoy seeing how something fits together for myself). Assembled it in about 60 seconds, was intuitive, clamped my folder, started sharpening. It was very quick to reprofile my Spyderco Domino with CTX XHP blade. Like about 15 mins of work, even with the learning curve. Without that it would've been 10 mins. I had to learn the hard way that there are some pitfalls that are easy to fall into. The sharpening arm is EXTREMELY easy to rock accidentally while making your stroke. If you do this, even a little, you end up with a...shall we say...multi-facted edge that looks pretty bad!
If you practice a little and get the feel of how to make the strokes, you kind of find the right balance between sliding the sharpening arm downward while also rotating it laterally. Similar to how I've heard people describe things like EdgePro: it's a learned skill. In just a few minutes of experimenting, I got better at it. Got a reasonably good edge, it would push-cut an 8-inch length of receipt paper all the way thru, fillet up curls on the surface of the receipt paper without going thru, and easily shave arm hair.
If you get the stroke down pat--I generally went heavier on the coarser grits diamonds, got lighter as I changed grits, and used only about 5 extremely light strokes when I got to the ceramic--I think this could potentially be a very useful little sharpener if one wants an inexpensive guided sharpener. It is not as robust or well designed as something like a Wicked Edge, obviously. And it definitely doesn't give you the control of freehand sharpening. All that should go without saying, anybody who thinks a device like this is "better than" or "as good as" something like a Wicked Edge, needs to get a grip on reality. There's a lot of plastic in it, and I've no idea yet how robust this thing is, or how long it'll take for things to start falling off or whatever. But initially, with the caveat you have to learn how to do the sharpening stroke consistently, I'm pretty impressed with the edge you can get and how easy it is to use.