After trying at least 3 of these units, directv has admitted that they don't work over HDMI with about 1/2 of all TVs. They CLAIM this is the TV's fault, not the recievers!! Funny, everyone elses HD units work fine on these TV's, but DIRECTV still insists it's the TV's fault, not their non-functional reciever. Don't accept this junk for your money. Insist on TIVO returning. TIVO works. This unit can't display HD, freezes, drops audio, has lines in the picture, etc. Don't accept it, demand dual buffering. Call and write DIRECTV and insist on it, it's your money. Don't waste it on this non-functional unit. I only wish I could give 0 stars.
PS DIRECTV has also admitted they COULD have dual buffering, but they won't pay TIVO to lease the copyright unless enough customers complain about the loss of dual buffer. I've made it my mission. Call them, write them, stop trucks on the road and berate them. Insist on dual buffering and you may get it back. Remain silent and you'll get nothing. That's direct from directv's customer service.
chase.carey is the president of directv, if you can figure out his email (just think, where does he work?), email him.