Anthony E.wrote a review of KS LEV Dropper Seatpost on May 28, 2017
Familiarity: I've put it through the wringer
This thing totally transforms the riding experience. Now, instead of feeling like I'm gonna go over the bars on the really steep sections, I just drop the seat and get down/into the bike and go with it. Hitting downhill turns are easier too because when the seat is down you can get low and drive the tire treads into the dirt and rail it. I have so much more confidence in my riding now. Downside, a few months after the 2-year warranty expired the seat started the dreaded "sag" when I sat on it (I used in mostly dry, dusty SoCal conditions and cleaned after every ride.) It was ready for service. REI took care of it for me by sending it off to the authorized repair center, charged $65 total--new cartridge I believe. Took two weeks! The post is now tight as new, even the tiny bit of left/right wiggle is gone. During those two weeks I discovered how dependent I'd become on the LEV, riding was either filled with stops to raise/lower seat or I was caught riding uphill with seat down or tentatively dropping into steeps which I could have easily hit if my seat was dropped. People complain about droppers needing service, but it's just like your shocks that need periodic service--you have to do it. They are pricey... wait for a sale, then jump on it.