I bought a used frame from Pinkbike, the previous owner had the CTD modified by Craig Seekins @ Avalanche for a 200 lb rider. I'm 220, I should get it revalved (or lose some weight - I'm working on that), but it feels "good 'nuff" for me.
My previous shock was the RP23, the CTD modified vs the stock RP23 is very noticeable.