I used to have two TivoV6 and was then offered an upgrade to a new Tivo with new features, i bit the offer. Big mistake. The two V6 boxes were independant recorders that could share playback.
The new Tivo box has main recorder and smaller slave which does not hold recordings, just plays them from other box. This was a loss of recording flexibility and reliability.
Then so many features on the V6 were and to some degree are still missing. Granted there are some nice features but it was painful getting here.
It was sold to me as a Tivo360 pairing but whatever it is called now it waz a painfull upgrade.
These boxes are by Humax I believe
I will ring 150