My own car uses gaz as they were a far bit cheaper than protech at the time
I have driven a roadster with protech shocks and it handled almost identical to my car when on the limits (very well and controlable)
However the protech ones are a different class in terms of build quality compared to gaz! if they were as closely priced as the group buy when i got mine it would have been protech for me too
Cant comment on reliability, havnt had any issues with mine as yet (quick get a piece of wood
) but have heard a few instances where the gaz shocks leak
I think Ash g had this problem with one of his shocks before he had even driven the car!