I had a RAD valve and went to the VForce.
The RAD valve seemed to "move" the power to the upper RPM's - didn't make more power just moved the powerband further into the RPM's. I didn't care for that too much.
My VForce seems to make more power eveywhere and it's smoother to boot. The spacer made the power feel almost electric it is so smooth. Just a real strong constant pull from off idle all the way to the top.
Between the VForce, the balanced crank, the spacer, and the flywheel weight this thing is as smooth as a baby's ass and pulls like there is no tomorrow.