i gave this a shot before i read this, hoping it would work. it seems, well, incredibly bad performance for me. but i've not really played on 64bit mode, with vista ultimate 64, installed default 64 bit version, then just copying the folder over. i seem to only be using 1 or 4 cores on the cpu(alt-tabbing out and seeing only one core loaded for previous amount of time). it could be as its not "installed" as 32bit, and maybe it changes the tag's it uses on the .exe to load if it detects more than one core on startup. the process has affinity set to all cores though.
either way, its weird, first try it worked fine, i added a bunch of skill points which is really the only thing i wanted. but only added 15 or so, then when used up the next time i tried to add skill points it simply would not add anymore, even reloading game, activating, waiting for level up for there to be a single point, then trying, just uses the point you get from leveling.
main reason is the power descriptions are absolutely terrible. completely wrong or lacking in information. some info doesn't come up until you have the power. for instance summoner's, it doesn't mention you can't have both the default tank guy and the health guy at the same time, it also doesn't mention (or didn't in beta) that meatshield gives him health regen.
basically want to mess with skill points to test out the powers quickly so i can go online and not waste months on a character only to find the powers are useless. i took the health guy, whose fairly useless, and a phase elemental, who is also next to useless.