I had a 1800 Electric unit. My main complaint was that it you either had the turbo washer thingy which spins around and has a damaging needle affect, or you had the adjustable spray, which because it forced the water through the baffle, significantly reduced the force. The hose eventually burst, so I replaced the hose and handle with a conventional handle with replacable tips. As it turned out, that actually cleaned much better than even the turbo nozzle, and was much less prone to damage the surface. The pump eventually burnt up - meaning it overheated and ruined the check valve springs. SO I replaced it with a 3200 PSI gas unit. That unit is tons better than anything else I've used including my brothers 3000 PSI unit. I use a wide fan from a significant distance. This means it cleans fast with no damage. Spring cleaning that would normally take the better part of a day, now takes about a 1/2 hour, and the boat is cleaner when I'm done.
SO my opinion is, if you buy an electric, throw away the hose, and get one that you can use detachable nozzles. Or if you want to get serious, buy a 3200 or more gas unit, and just use it from a farther distance away, and take 1/10nth the time to do the job.