Meh. I have a couple of those style and am not really fond of them. They don't sharpen all the way down to the lower end of the blade, so you wind up with this ever increasing ledge near the handle of the knife.
I bought a Fiskars log-splitting axe. It came with a ceramic-wheel sharpener FREE! Did wonders to every edge I dragged through it. Mind you, I'm not trying to shave with machetes, axes, hatchets, mower blades or bread knives...I'm doing real work. It's really more of a honing wheel, but if you have a decent edge to start with...
I have this one, it's a little overkill, but you know, it's how life goes, mo powa Presto 08810 Professional Electric Knife Sharpener https://smile.amazon.com/gp/product/B000TYBWJ0/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I’ve got the Ken Onion and it does a really job. Nothing works as well as knowing what you’re doing with stones, but I’ve usually got better shit to do than spend all day scraping knives against stones. So the Worksharp lets me hammer out a bunch of sharp knives in short order.
Chef's Choice sharpeners like this have been touted by folks (see Cook's Illustrated c. 2002) for a long time. I had their model 130 and it worked pretty well on normal German-style knives with 20 degree bevels. If you have eastern knives with shallower (read: finer) bevels, it will retool them, and they wont cut as nicely. The little diamond wheels wear out pretty fast. I'm not sure if they are replaceable; they weren't when I had my unit wear out after about 3 years (it cost about $150 and i think was heavier-duty than the one shown here). I use these now: DMT. YMMV.