TiVo TCD540040 Series2 40-Hour Digital Video Recorder
If it had worked when I got it, maybe higher.
I had problems with my Tivo right out of the box.  A consistent buzzing and crackling sound would come from the tv when the Tivo was connected, and then the picture would freeze sometimes.  After a weekend of playing with it, and searching their website, I discovered that this problem is not uncommon, and has been occuring for over a year.  They were very good about replacing the unit and shipping a new one (which I have yet to receive), but the process has taken a month.  My rating of a 3 is optimistic that this new unit will work.