Sadly, it works. my G10 can loop over at least 20% faster (guess), its very noticeable.
I think this is beneficial mostly in planes that tend to compress, you can start your turn, pull the stick all the way back, then press elev trim up, and watch the blackout come on like a freight train.
I'm not gonna pretend to be a super pilot and let people wonder how the heck I turn so sharp now. Gonna be up front and tell ya how its done, in case you didn't know, and I don't think too many people DO know, except maybe the old WB's guys.
Am I wrong?