I know from reading the reviews that the HR20 does NOT have dual live buffers. My question is if you're recording something on 1 tuner and watching something live on the other tuner, will you have the 90 min buffer on the tuner that you're watching live? If you can it would be a work around for not having dual buffers. If there's 2 shows you want to watch then you can record one and watch the other one live (and still be able to pause and rewind) and then just watch the recorded one once the other show is done.