Mine were great at first but get sticky after a few hours of use. Also the rebound damping disappeared. I took them apart and found them to be bone dry on the seals. I also changed to 10w oil.
Long story short, the 10w oil made the compression stroke feel shit and restrained (not recommended). I ripped the air seal trying to get it back in from the bottom (shit design – cartridge in stanchion, why they don’t use the stanchion itself like RS is a mystery to me). Rebuilt them from the top, which was very tight but I used a handlebar on my socket wrench to get more leverage.
Eventually sent them back. They came back after a week feeling as good as new.
My advice is, keep them lubed up inside, and be very careful when trying to put the air head back in from the bottom of the leg.
In use, great. They are very smooth and composed. Definitely better than my other current forks on the compression stroke (Totem RC2DH, Domain R, DJ2).