I use my Roamio Basic to take content back and forth to my GFs house. But most of my recordings are done on my Roamio Pro, and then transferred over to the Basic before I unplug it. The smaller size does make it very easy to take with you. I have a remote and power supply at my GFs house so I only need to take the box with me. It has worked out much better than when I used to do the same thing with a two tuner Premiere.
TiVo Mini x4
Roamio Basic OTA
40TB unRAID1--53TB unRAID2--36TB unRAID3