Springback Springsoles - any experience of these things?

If this has been done before, appologies but the Arrse search function is still out.

Springback Springsoles: Claim patented / trialled results for increasing speed, endurance reducing injuries etc. Sounds too good to be true and there seem to be some mixed reviews out there for some sports so I wondered if anyone on here had had any experience of them. Usually anything that sounds too good to be true, usually is, but the patent and reviews on their own website make me think its worthy of further investigation! Linky

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