This served me well until ...
TiVo had a big Black Friday sale. I got to looking at replacing my aging TiVo Premiere (with a 1TB external drive) in the den and the smaller TiVo Premiere in the master bedroom with current devices.
I bought a TiVo Roamio Plus for the den and a TiVo Mini for the master bedroom.
This tremendously simplified the number and age of the moving parts.
I replaced the 1TB hard drive in the Roamio with a 3TB even before I powered it up.
The Mini is pretty much a regular TiVo with no tuners and no hard drive. It "borrows" a tuner from the Roamio as needed and streams recordings from the Roamio.
The Roamio supports streaming to mobile devices so I can watch recorded programs on my smartphone or tablet.
The November 2015 software update added QuickMode.
QuickMode allows you to play recordings faster - at 1.3 x normal speed - with pitch-corrected audio, so you don't have to put up with high-pitched squeaky audio while you watch your favorite programs in less time.The Roamio came with 12 months of TiVo service included and going forward service will be less than half of what the Premieres cost. The Mini doesn't require TiVo service. Nor does the Mini require a CableCARD so there's less money to Comcast which is always a good thing.
The break even is just over a year and the savings are $20+ per month after that.