I am considering purchasing a 921 DVR. I have read the various threads on it but most of them are quite old. What is the current status of the 921's software and reliability? I would be using it to record quite a bit of OTA HD programs and some other HD & SD programs. I prefer to own the unit so I don't want to get in line for a 942. I have had an 811 for a year and a half and have suffered thru all the problems and updates. It was annoying but overall I have enjoyed the 811 despite its problems. I understand the 921 could be obsolete in a year or so and I am willing to deal with that when the time comes. I just want to know if the 921 has improved as much as the 811 has over the past year.