Just had our TIVO box installed today. Very nice young man fitted it and so far all seems fine with it. SD picture is as good as it was on the V+ box, not 'soft' as some people have said. Still playing with it so haven't really got anything else to say at the moment.
However one thing I would mention to anyone else who is keeping their V+ box and moving it to another room, make sure you ask them to bring along an HDMI cable or buy one. We had our old Samsung box replaced with our V+ box, but have no picture as apparently it's set to only work with an HDMI cable, so now have to go out and buy one and hope that it works