Like, asuming well taken care of, how long do electronic drums usually last?
Forever
I have two simmons drumkits merged together into one kit, with various other roland drum pads mixed in, and its never failed me. Of course I got rid of the simmon's analog brains long time ago, and feed the drumpads to a midi trigger to fire newer, better sounding drum machines and samplers.
From my viewpoint, as a studio owner, I see two major advantages to owning and using an electronic drumkit.
First, it tears down and takes up less space than an acoustic drum kit.
Second, you can change the sounds as often as you want to buy modules, drum machines, or samples.
A minor advantage in midi recording, is one can adjust timing and or imperfections should the drummer not be the most amazing drummer in the world. A little quantization goes a long way if its subtle.
Drum pads have a different feel of course than real drums, and the like/dislike of the feel has to do with the drummer. Some folks like 'em, some folks do not. Electronic versus acoustic is one of those debates that will never be resolved, because both have advantages over the other.
For me, as a studio owner and non-drummer, I like the fact I can fit the entire electronic kit into a closet and still have room for other stuff. If I were a true drummer, I might feel differently.
Though of the several clients that's used my studios over the years, no one's really bitched about the kit I have. Some drummers bring a full setup, some use my kit, hey, its whatever works.
I happen to agree with other's comments that using "real" cymbals is a good thing, I've yet to really like sampled cymbals or hi-hats. Tolerable yes, awesome, no.
Best of luck!