The power tap is a tool just like anything else. You'll get out of it what you put into it. I've been riding long enough that I'm very in tune with what my body is doing and am pretty good at setting a proper effort level when I race/ride. I see a lot of people throw a lot of money at tools that never get used or not used properly. I would say, that after you have done your research, a power tap may be a great investment for you if you're going to really use it.