I got a dual tuner TiVo Premiere earlier this year from Best Buy. Made it a lifetime unit as well. Also wound up getting the Best Buy extended warranty since it was 4yrs of total protection for about $20. Seemed like a better deal than Tivo's at $40 for 3yrs.
Anyway, as the world of technology constantly changes, I am now looking for a better whole home DVR solution that also involves not having to pay Comcast additional cable card fees. Therefore, the 4-tuner Premieres with one (or numerous) upcoming TiVo "minis" might be a good option (depending on the mini price) since it would take just one M-card.
To offset the price of this possible 4-tuner Premiere setup (w/ minis), I might then sell this lifetime Premiere (with a Best Buy warranty) on ebay. Can BB TiVo warranties be transferred to someone else? Or is strictly based on the buyer?