as cougs says, if you want to wast...spend your money on trying it that's your call
I read something this week that the inventor of the technique in Japan agreed that he had no proof that it works on injuries - and certainly no trial data to back it up - yet it's been used for over 20 years and many claim that it helps. placebo effect maybe???
your best bet to get close to sub-3 is to pick the brains of the regulars in the sub-3 thread in Spring Marathon section - there's a lot of collective experience there that will probably help you more than any tape