I have a Dropzone and 2 reverbs. The Dropzone is ancient, 5 years old I think, it’s properly failed once in all that time (£75 fix, basically poured out all the internals into the bin and replaced them) and otherwise has just had basic services (which aren’t exactly simple, but not brain surgery either) Great kit.
(it’s slightly different from the current model but still fundamentally the same design)
The 2 Reverbs, not so much. The 150mm one’s gone saggy once, the 170mm’s been replaced on warranty and is about to go back again. They’re great in use, the 170mm drop is awesome tbh, so it’s not all bad but they’re annoying. (I can actually fix the sag myself, it’s only about as hard as a fork service, but it’s still inconvenient)
In all honesty if I was buying another dropper tomorrow, it’d be a 170mm reverb despite all that, the long drop is superb and tehy don’t really have any rivals there (KS and 9point8 are doing the same or longer, but they’re way more expensive, £500+)
The KS Exaform is interesting too though. Basically an accurate Hite Rite so it’s all manual raise and drop, 175mm drop, pretty cool. You can’t use an under-the-seat dropper the same way, it’s a bigger difference than you might think but immediate convenient drop and raise is still handy, and that’s a lot of drop.