Installed .76 on both mine and my wife's phone. We are both noticing a major difference in performance. My phone has almost no lag whatsoever.
I am noticing 1 bug that .75 and .76 have that .65 didn't have though. When I answer a call, the touch screen buttons for "Speaker", "Mute", etc... don't show up, I just get a blue background until I click a physical button (menu, back, etc). Before it would immediately bring up those buttons so I could switch to speakerphone right away. But considering the performance increases in the rest of the phone, the speakerphone bug is a minor annoyance.