Eric H.wrote a review of Wahoo Fitness KICKR Climb on November 10, 2018
I did NOT use it synced to Zwift so am not commenting on that feature. And NOTE, because it makes the bike pivot at the rear drop-outs, using it on anything other than 2017 or later Kickr risks serious bike damage.
Seems very well made and even without Zwift or similar usage, it is really, really, nice to be able to mimic hill inclines without getting off the bike and adjusting a front wheel block. $600 is a lot, but if you have a Kickr (for compatibility), I think this is a game-changer for indoor riding.