Eddy Merckx never used a power tap. He also had five rear gears. My guess is with that setup, if he was 25 again he'd still beat the crap out of everyone.

Point? If you don't have talent, a power tap is expensive nice to know information. It will make you marginally better. But like I said in a fit thread, we had a guy work with a trainer for a year to increase power less than what we found in two hours fixing his "I know what I am doing" crappy setup.