I've heard it works pretty good... at least enough to be noticeable... don't do it until your engine is very well broken in tho because it may prevent the engine from breaking in properly and completely. We used to have that issue with high performance car engines when a customer would put the best synthetic oil in the engine right from the get go and the engine wouldn't break in because the oil was doing too good of a job. It's perfectly ok in my book to use a good quality dino oil the first 500 miles, or 10 hours of run time, then switch to the good stuff.
From what I've read, this stuff is supposed to bond to the metal at the molecular level in order to make the surfaces considerably more slippery, thus preventing wear and freeing up a little more power. According to Fred, he has claimed it works so good that a one way sprag clutch would slip after treated with this stuff, if that's true, then this would make a seat of the pants noticeable difference in these little engines and would be worth the effort, especially for wear protection and even more heat prevention.