Mine was one of the first batch from Tower Hobbies and has been perfect on several different old and new FHSS receivers, I don't have any FAAST receivers so cannot comment on those.

I have not upgraded and have no intention of upgrading on the current information. I am still extremely happy with the px and it has got more comments from other racers than I expected as to its looks and feel when others have tried it.

A few national level drivers did comment that early units seemed to have issues when they saw them being used a few months ago but all good now from what I hear.