Got out the brave pills over the weekend and reflashed my TM2 from VIX to 4D (I get the odd black screen lock-up for no apparent reason).
Gave it a whirl for 2 days then went back to VIX (although that too was a newer release), for me the VIX interface just 'feels' a little more intuitive.
The 4D bouquet system & tuner set-up seemed much more cumbersome to me, perhaps I'm just used to VIX after 4 weeks but I'm sticking with it.
Soup.