I found my dad's v+ box (While I was house-sitting last week) slow, clunky and very bad at responding to the most basic things, like changing the channel.
I was hoping that it had been improved since I had one myself.
Now, having said that, I did find that the SD upscaled picture on his box much better than on my sky HD box. But I found my HD picture better than that on his virgin box.
So I guess it's swings and roundabouts.
I realise I sit much closer to the TV than would be considered normal, but that is the only way I can watch TV really.
p.s. I still prefer the virgin colour scheme and would like the option for that on sky