So far, after almost 48-hours of running .247 I can truthfully say that it's the fastest, smoothest, and most stable OS build I've used to date. I am totally impressed with the huge increase in battery life...
The only glitch I can find is the "white screen" I get sometimes upon pulling the Bold from it's belt-clip leather holster. Hitting the back button takes care of it quickly...but it's a nuisance anyway.