Here is another review of the TiVo, but I'd suggest it's approached with some caution as it is dated December 4th (pre-TiVo 500 rollout) and would be of an early version of the software/hardware. A little concerned regarding the comments on upscaling - I watch far less standard def these days but I would be disappointed to lose the SD upscaling capabilities of the V+. Having said that, the SD versions of the Sky Movies channels are pretty dire.
I'm not sure how unbiased this review is - it's from a forum for MythTV and reads like a promotion it to some degree. It also leads with the negatives rather than positives.
Maybe someone with access to a TiVo can review this review? I know VM are tight on confidentiality but it would be interesting to know a little more. I can be contacted via firstname.lastname@example.org.