I do have one on my expert and do not like it much, I did lower the pressure a little bit so that the return is not too violent (did the same with the 30.9 without issue). The problems that I am experiencing are:
1 Many times it is difficult to make it move from the top position even when fully depressing the lever, it seems it needs to be pushed down at exactly the direction of the shaft.
2 The ratchet does not lock positively, it needs to go up a tiny bit to lock, otherwise it will randomly go to the full down position the next time you sit.
In a few words, you can not fully trust it will work as it is supposed to and you need to pay attention when riding.
Hopefully there will be a fix soon.