I have a TiVo Series 2 that is set up to receive the 4 networks from cable and sat. channels from my Dish 811 . Being a NASCAR fan, I record the Nextel Cup and Busch races so I won't be tied to the TV for several hours. I have season passes set up for both series, and pad the scheduled record times by 1 1/2 hours. Sadly for me, this isn't enough. I've missed the end of several races that ran overtime due to accidents or weather. If NBR on the 921 or, for that matter, on the 510 or 721, gets around that issue, I'm all for it! So that I can watch one live program while recording anotherI've got my retailer looking into getting me a 721, and what, if any, costs above the $249 might be involved for switching to a quad lnbf.