I use win7 x64 for about 3 years. Cubase 6 x64 for about 5 months. Mostly i use cubase x64, but am forced to use 32bit because:
1) symphonic choirs word builder (kontakt/kompakt version) doesnt work in 64bit daws.
2) reason 32bit can't be rewired to 64bit host. And i cant afford latest reason the one that supports 64bit rewire.
Win7 64bit OSX SnowLeo and
i7-920 / 8GB RAM /ASUS P6T/ e-GeForce 7200GS graphics
-Cubase 6.5 -RME Babyface -Presonus StudioLive -M-audio ProFire 610 Yamaha NS-10M,ADAM A7X, AT ATH-m50. -AKG c414bxls, Neumann TLM103, Blue Bluebird, Rode NT1-A, Shure SM7b, Sm57 3x, Sm81, sm58, senn. e838