My TiVoHD been very very good to me. Why upgrade? HDUI? meh. More Efficient? Meh. MRS? (To another TiVo) Meh. More tuners? Maybe. TiVo Stream? Maybe. Mini (At a decent price, including lifetime) Yep! On it's own the Mini doesn't push it over, but cumulatively with the benefits above could finally push me to upgrade.