I own two -- an American Angler "regular" and an American Angler Ultra. The regular actually works somewhat better for me. The blades for both dull in a season or less, but are cheap enough to replace.
I have two so that my fishing partner can do his share of the work, too.
Since croaker is my favorite eating fish, and since I have more than a few landlubber friends who don't get to the Bay but love for me to give them cleaned fillets, and since even a big croaker has an appallingly low meat-to-carcass yield, several times a year I keep croaker by the coolerful.
Note: Virginia water, so those from MD should not mention that horrible number "20."
Anyway, cleaning a cooler of croaker *without* an electric knife is a good way to go insane, miserable hour after miserable hour.
i note that I also own a superb wood-handled unpowered fillet knife made I think in the 70's by J. Marttiini of Finland that is a joy to use if I'm only cleaning a few fish, so my use of electrics is in the interest of time, mainly. Also, I don't normally use my electric on rockfish; they just seem to fillet better using the Canadian method, which isn't practical with an electric.
Here's a great trick. You can now buy -- for about 20-25 bucks -- a small power inverter for your auto. Bring it and your outdoor extension cord when you go fishing. Now, even at a fishcleaning stand that doesn't have electricity, one person can square away the boat while the other zips through the day's catch.
We also do a fair amount of overnight catfishing from shore. Same trick lets us do the messy work there rather than at home. (In case you've never tried it, catfish do fillet quite easily, and you can remove the skin same as you would with any other fillet.)
In short, if you do a lot of fish-keeping, an electric is a great investment. Been using them for about five years now and have never regretted it.