I picked up the 708 at my local Nebraska Furniture Mart the day after it became available (I was going to get the 608 until I realized they had the 708) and so far it's working great.
I only have a pair of Paradigm Atom v5 Bookshelf's and a Final S110 sub connected to it at the moment so I can't properly test it's full capabilities but so far it's integrated seamlessly into my home theater setup (AT&T Uverse, Oppo BDP-83, Roku HD, and home brew linux media server). I had no problems connecting it to my network or setting up the streaming radio presets.
It does have a Windows 7 compatible sticker on the front face plate just to the left of the front HDMI port. I can take a picture of that if you want me to verify it.
- Brad