@rightly what do you want to do with the electric piano? Are you looking for an actual Rhodes or Wurlitzer like Subvive is describing, which can be finicky and as noted hard to keep in tune etc (but fantastic fun to play!!) or what I would call a "digital piano" which is basically a keyboard that can be used as a piano with a midi output that can be used to create other instrument sounds in a DAW? I was assuming the latter but now I'm thinking if you're worrying about them breaking down maybe you are looking for the former.
I've had a couple of digital pianos over the years and they were fine - first was a Roland and it lasted for years but I basically wore out the keyboard and it started to get a bit sticky... but I'd had it at least 15 years at that stage.. I'm not sure if I could have got it fixed but a friend was looking for one for her kid so that's where it went and I got a Nord that's being doing its thing for 7 years now..
I've also had a portable Yamaha banging about for years and have had no trouble with it at all..
So my experience with digital pianos has been very positive but maybe that's not what you're looking for at all (which is why you asked about e pianos!!)
Karen