I have an electric that has been care free for 10 years. Mine is a bit unorthodox though. I have mine mounted on the deck about 10 ft before the shallow end and I have storage boxes above it. So ,I essentially have an above ground "vault" as opposed to "vault" below ground level so it cannot flood as is suggested by another poster. I am not familiar with the hydraulic units but there must be an electric motor to run the pump for the hydraulics right? If that is the case, then that motor would also be susceptible unless it is located elsewhere? I also saw in another post that someone had mentioned the hydraulic was potential better because it was "locked". Have to disagree on the insinuation because there is no way to push my electric cover back. No way - no how. Also saw yet another post about broken shear pins on an electric unit because of hitting a ladder that was left down. I am not aware of any shear pins in my system, but I do know mine has current control, meaning, if there is something in the way motor current goes up and the system tells the cover to stop or not move in the first place. I have had mine "over current" numerous times for various reasons and never had to do anything other than to find out what is in the way. Hydraulics sounds like a very robust way to get the job done, but I have been very happy with my electric. No idea which one is more affordably these days though. I am guessing the electric?