I'm actually testing it out right now. I was going to do a quickie video over the weekend with my experiences.
It works great in some ways, with 2 caveats:
1. You NEED to be able to have an internet connection with at least 30 Mb/s --> so you got to have at least a decent cable connection. Don't even think about it with DSL.
2. Getting peripherals to work is wonky. If you use a mouse and keyboard, you are ok. Dual joysticks? I haven't gotten stuff like that to work.
Also, while it has beta support for a mic, there is no support for a video cam, so FOIP isn't going to be available.