The good:
I really like having an electric can opener that doesn't take up a lot of counter space or under-the-cabinet space. And since I make a lot of meals that require a lot of cans (broth, beans, tomatoes, etc.), using a hand-crank opener isn't a lot of fun.
It's opened every can I've given it without any trouble.
The not so good:
I've probably opened 50 cans with it so far, and it hasn't completely taken the top of of one yet. There's always about 1/4" of uncut metal, so I have to twist it back and forth till it breaks off. It's not terribly fast. If you're only opening one can, it's no big deal, but if you're making my world-famous black bean soup, you're looking at about a dozen cans. Unlike normal electric can openers that turn off when the sense the top is off, this one is simply based on a timer, and I think they've chosen a worst case scenario (one of those #10 6 lb cans), and you have to wait while it goes around the can twice.
I'm also not completely thrilled with taking the top rim off the can. For one thing, if you're planning on using up half a can of dog food, there's no rim to hold on those plastic tops that we use. Also, when I open a can of tuna fish, I generally push the top of the can down inside on top of the tuna to help drain it into the sink. Same for a few other canned goods like mushrooms. These lids still have the rim attached and won't fit into the can.
I also like to put the top of the can inside the empty can when I crush it and throw it away. Can't do that with these.
None of these complaints are enormous on their own, but all together, I don't think I'd recommend one.