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The 4 speed fast forward is about the only feature of the SARA HD DVR that I thought was an improvement over Tivo. Seems like it would be relatively easy for Tivo to add to the 3 speeds that are already there (not like it is a brand new feature).

Anyone know why Tivo hasn't done so already?

Probably the same reason TiVo doesn't have two or six FF speeds, when you design a produce you have to have some spec. to go with, this is the first complaint I heard about FF speed as most of us use the 30 second skip.