Actually, the PC studies have little ambiguity in them, if you read them carefully. But, that is subject to interpretation i guess. Either way, I don't think anecdotal evidence in the form of testimonials is "more believable" if oe is trying to prove the benefit. But, it is frequently "more believeable" to the average person, who may not be skilled at interpreting studies and when studies may not be adequate or exist, to answer the question, "So what does all this mean to me? What might I see?" And, when combined with a 90 day money-back guarantee we think it is enough to convince many to give them a try to see what happens to them. How many power meter manufacturers offer a 90 day money-back guarantee? Obviously, it is not enough to convince you and many others here. So be it.Steve_B said:But if the PC studies have enough ambiguity with them (as they apparently do), why is this more believable?