I had high hopes when I saw this dropper come out. Perhaps my issues are related to the 170 model and the bushing overlap needed for a dropper this length.
Overall, I love OneUp components. I have their steer tube EDC, bash guard, etc. and they've all been great. I even like the carbon dropper trigger that get mixed reviews. The craftsmanship is great on this dropper and I hate writing this review, but I did have to return it. I didn't take a chance and get a replacement so perhaps I had a dud.
First, the stiction was terrible. This is by far my biggest complaint. Right from the start, I noticed the seat post portion is much smaller in diameter than the other droppers I've used. Perhaps this is the cause of the binding. However, getting the initial travel to start always involved some sort of wiggle dance or bum up/down on the seat and then you could feel the stiction all the way down. Then on the return, it would never top out. It required 2 or 3 stabs at the trigger to get full return length.
The other issue I encountered was the seat post continually slipping down the seat tube until I torqued it to at least 5.8 Nm. On a carbon frame, that's getting right up against the torque limit. This might be due to the very smooth finish of the outer shaft. All other droppers I've used have had a textured finish. However, that's just my speculation due to my experience and observation.
If I didn't read other similar reviews, I would have written it off as a one off. However, I've read where others have experienced the exact same issues, so I decided not to try a warranty replacement.
Ultimately, I returned this dropper and replaced it with a Fox Transfer. So far the Transfer is the bar for me. Silky smooth and reliable operation. The only small downside to the Transfer is the return speed, which isn't as fast as others, but certainly not a dealbreaker unless you require supersonic returns.
As always, the Gearheads at CC are amazing. In this case, it was Matt Conn, who knows his stuff and never dropped the ball once when I decided this wasn't the dropper for me. So kudos again to CC.