Yes, on my 331.
Best rest I have ever shot.
Yes, IMO a better rest than the Drop Zone without question. Flexible launcher, adjustable spring, better arrow support through better timing from being limb-driven, can still shoot if the cord breaks, quieter, etc.
Stupid simple to set up. Took me 45 minutes the first time, and that included removing old rest, installing limbdriver, adjusting appropriately, paper tuning, and walk back tuning.
GRIM, question for you... On my bow with the launcher arm set up with the bottom of the arrow 2/3 of the way up on the Berger hole (as recommended in the Ross tuning DVD), arrow set to perfect center shot, my nock point wanted to be 1/4" up from level... You said your bows seem to want level nock point with your limbdrivers. Maybe the 331 is a little different in that respect from the 334 and 337? Just trying to figure out why my setup might be a little different....
Checked to make sure, and the cam is in time since the set screw on the module is tangent to the limb like it should be. Any thoughts?