Cost and convenience are the factors I was thinking of here. It will cost $149 more to get the mini if I include lifetime on the mini. Hardware only the price breaks even. I have the expanded 1tb internal on the series 3 now. I had the western digital external for a while and that went out in about 2 years, so when the internal HD quit I replaced that with the 1tb HD in 2010. If I replace the HD its $149 and problem is solved for another 3 years. . .or it could be the HD is just noisy. The TiVo was in the livingroom for years so I didn't notice the extra noise. So I'm at the intersection of upgrading (downgrading to some) to the mini and getting the same interfaces plus quiet in the bedroom, on demand now and future promise of Netflix or replacing the HD and saving $149. Decisions, decisions!