Hearing about using an Xbox 360 as set top box for IPTV providers like AT&T's U-Verse is one thing, but seeing it in action is another. As you can see from the video after the jump, the experience is very fluid and isn't what we'd describe as laggy even in the slightest bit. The 360 can act as a full blown client to the Mediaroom DVR which provides a pretty complete multi-room experience. As far as we could tell the entire experience was there as well, but then again we're not exactly experts on Mediaroom. Apparently one thing the 360 can't do is be the only set top box in your house, which is probably a detail lost on many since we'd bet very few people who subscribe to pay TV only have one set top these days.