Before I got my XJR I had a sportsbike and went with 15 others to the Nurburgring a couple of years ago.
12 of us fitted Puncturesafe before we went and had a nightmare journey with wheel wobble and severe vibration, so much so that when we got back the company settled our collective claim for costs of getting it taken out and tyres cleaned. The 4 who didn't fit it had a much better trip and more fun at the ring. Most of us lost nuts and bolts, and my fairing even came undone on the autobahn!
Perhaps we were just unlucky, but all 12 of us? Oh, and the irony was that on the way back one of the bikes got a puncture and the tyre went down......?
I wouldn't want to influence anyone's decision, especially given the reseller's comments above about the benefits of fitting it which I'm sure are well meant, but needless to say my XJR now runs with what it is meant to have in the tyre - air!