I've had no problems at all as long as the content is not restricted.
Although when I sold my last Lifetime Premiere, I put the cable card from that box in my monthly Premiere which was OTA only. When I get an IP STB that Premiere will go back to OTA only and I will turn in that cable card to save $4 a month of my FiOS bill.
Roamio Pro (5TB)
TiVo Mini x4
Roamio Basic OTA (1TB)
53TB unRAID2--38TB unRAID3--33TB unRAID1a