I think the UHF Stereo output is awesome. This really adds to your ability to be creative when it comes to wiring.
Currently I have Dish and Cable with 6 TVs. I have 2 508s 2 1000s and a SA Tivo. One 508 is in the living room connected to a home theater w/Dobly Digital. The RF output goes upstairs to a A/B/C box in my bedroom. In the bedroom, Tivo records off of cable and goes out to (A),(B) is for the 508 downstairs and (C) is for the 1000 I have in my bedroom. The output of this goes into a UHF modulator down to the garage. In the garage, I have my second 508 and a 1000 with a pyramid to receive IR signals from the kitchen. Both the 508 and the 1000 are also connected to a UHF modulator. The end result, cable TV on all 6 in the house. Channel 89 is the garage 508, Channel 117 is either Tivo, the LR 508 or the 1000 in my bedroom, and Channel 125 is the second 1000 in my garage. It's a bizarre way to be able to record one thing on the PVR while watching something different on the dish, but it allows the kids to watch what they want while I can watch the baseball games I want while also recording whatever my wife wants, while letting the smallest in the house watch Barney and Sesame Street. The PQ, by the way, is excellent.