Just received my Team prime shock from Reflex racing.
I have not raced with it yet, but the quality is the best ive seen and it really is super smooth! well worth the money!
On the other hand, while waiting for this shock to be stocked and then to arrive here in oz, I managed to make my AE through shock extremely smooth also, but it took a lot of work!
I first finely sanded the plastic stops that hold the orings with 800 paper, then polished the plastic edges. very, very light work so as not to remove any material.
I then did the same with the metal rod and piston, buffing them to a high shine on my buffing wheel attachment on my grinder. The whole thing now is super smooth and works a treat.
Or you could just buy the team prime and build it with out any mods for the same smoothness!