I decided to bite the bullet and get one just to see what it's all about. I won't be giving up my HR10-250's anytime soon, however. The UI may be slow but I've been living with three of them for so long now that I hardly notice anymore. I certainly don't see it as a legitimate reason to drop the HR10 in favor of the HR20. The HR10 (or any DTV DVR) wasn't meant for channel surfing so if that's your bag, stick with a standard receiver.
I've never been a fan of UTV's for several reasons. I used to have three of them so my opinion is based on extensive firsthand experience with them. I'm not sure how a discussion of UTV's fits this thread but since it ws mentioned I believe that opens the door for my 2 cents on the subject.
1. Developed and tanked by Microsoft. That alone is enough reason to stay clear of them.
2. Drive upgrades are easy but extremely limited. The sky's the limit for an HDTivo.
3. Absolutely no way to upgrade them with special features like you can with a Tivo.
4. The monthly UTV fee is about double the fee for a Tivo-based DTV DVR and also the new DTV DVRs.
5. The UTV user interface was much easier to use than a Tivo. Think of it as a DVR for dummies. Not a bash as I rather preferred the UI of a UTV over most DVRs I've used.
I only purchased the HR20 to test the waters. I won't see any benefit from using it for a couple of years. I already get more HD locals with the HR10-250 than I'll ever get in mpeg4 (currently 14 OTA vs. 4 from DTV). The local RSN in mpeg4 may be something I'd watch on occasion but it certainly wasn't the driving point to own the HR20.
Furthermore, I live in the city and I can't pickup all of my channels at once with that OTA receiver because all of the signals come from different directions. I have to move my antenna based on what I want to watch.
While this may not sound like an attractive solution for you I have found it to work for me. I'm in a similar situation where I can get locals from both Baltimore and DC but the towers are in opposite directions. I just put up two UHF antenns pointed in each direction and then combined the outputs of both antennas into a single cable using a standard UHF/VHF splitter/combiner. Since the antennas are pointed away from each other there is no danger of picking up multipath interference from channels being picked up by both antennas.