I’ve had my KS i950-r (which I believe is the same as the supernatural, someone correct me if I’m wrong) for what must be over 3 years now.
It’s had a couple of cables in that time and been serviced once after I noticed it required pressure on the nose of my saddle to actuate the post, and a slight mark was created on the stanchion.
I also stripped one of the seatclamp bolts because they’re made out of cheese, I’ve recently replaced that and all is good.
So in that respect it’s essentially been bombproof and I would buy one again. However, where the cable attaches under the seatclamp gets absolutely full of crud and eventually gums up, meaning you have to clean it regularly, to bodge this I’ve fitted a rubber o-ring around the lever, tensioned the ring (by twisting it, uber tech) and attached it to the seatclamp rails, this way there’s a decent ammount of tension on the lever so it springs back nicely after using it.
My remote is also pretty bashed up from crashes, and has been taped/filed to get it working again, although I reckon I’d have broken a reverb remote properly by now. Despite the above these are my only niggles.