i installed it on my 2.2Ghz celeron laptop...you should be fine...I like the look and feel of 11 and i'm going to keep using it the way i did before the beta: WMP for single songs and AVI/WMV video and iTunes/Quicktime for everything else. I also had this beta about 3-4 days beofre Trotter's post.
I checked the properties of WMP11 and it doesnt say Beta anywhere in there. Nor did it on the install. I think this is the final version. It was slated to be released on May 17th but got leaked a little early.
I do not accept support questions via EMail, PM, IM or my G+ page!
Phone: LG Optimus G Pro
Running: Stock JB from LG with Nova Launcher