I upgraded an 8920G x64 from Vista to Windows 7, but I'd hardly call it painless. In truth now that it's done, I don't think it's worth the trouble. The devil is in the details. I actually upgraded 4 times before I got it right. A lot of work involved in updating drivers, although most worked fine without upgrading. A few really geeky quirks that were repeatable during each upgrade and it took weeks to learn how to fix them properly.

Thank god there is an 8930g, because it has all the Acer Win7 drivers that work perfectly on 8920g. The only trick was running eTechnology Framework in XP SP3 compatibility mode because it doesn't like Windows 7.