I run one on my full susser and my hardtail.
I thought it was a total gimmick when the Reverb came out 2 years ago – but now, in my opinion, its up there with disc brakes and SPDs
I’m 6ft 4″ and have always struggled with stupidly long seatposts getting in the way!
Wouldn’t be without it now on my main bikes. They’re pretty reliable now as well
Also really handy when getting the bike with wheels on in the back of the car and really, really handy when you come to stop waiting for people, and you can put your seat down and wait comfortably on the saddle
I also use a rigid SS a lot, but this does not, nor ever will, get a dropper, as its used to make me refine my riding – although i do miss the dropper!