I tried the Ncode, K-Factor, BLX and BLX2 Prostaff editions.
Liked them all, very minor changes in each one. Ncode was slightly softer than the K-Factor, which is the stiffest one of the bunch. BLX was VERY muted, almost too muted for me. Prostaff BLX2 edition is really nice, feels faster than the previous 3 and has more of the K-Factor feel.