Many around me have tried the fuel (Jennings, etc.) and I decided to give it a try in my R1 while at VIR this past week-end. I was expecting my bike to smoke a bit, but it really didn't at all (9k track miles on bike too).
I did notice a small improvement in power delivery and also an unexpected side effect: my bike was quieter while idling. I've heard the pitch about internal lubing, etc. and can only go by what Jeff P. has told me, but I clearly noticed less engine noise.
Then there's also the added benefit of baffling your opponents on the track if even for 100ms while they're scratching their heads thinking "what the hell is that smell!!!!" I don't know whether I've been around it enough to become desensitized to it, but it really doesn't smell that much. People behind me stated I smelled like french fries, but they could tell it was some kind of race fuel.
I'll run it again, but also interested to see before/aft dyno results.
Go chicken juice!