I have to say that I'm surprised by some of the comments here.
Let me get this straight: an average masters racer who doesn't know what he is doing (no medical supervision) injects himself mid-season and sees a 9% sustained power output and people don't think this is a significant advantage? Never mind the recovery advantages and the potential for eliminating some bad moments in a race, in my mind 9% is huge. For anyone who raced at a high level and was clean you must look at this data and be shocked. What in-season training could you do to improve 9% sustained power from mid-season to end of season??
Combine this with the comments of Kimmage and Voet from their personal accounts of the single use of a stimulant and I really have to go back and rethink my personal racing experiences.