AF, unless you have found a way around the memory leak (ie a permanent fix), I dont see any reason to use WM6. Its a matter of personal preference and no one answer is right.
Vista had a lot more added to it than WM6 did over WM5 so i had a harder time dumping Vista than dumping WM6. It was a no-brainer for me.
Oh and i cant comment on bluetooth. I dont use it. *hears everybody gasp*