Its not that great at the moment, I have it in our bedroom but only because sky offered us a good deal, same monthly payment as my previous Sky+ and a free box. If we didn't get that deal I wouldn't have bothered just yet.
There isn't really a large amount of HD channels to benefit from the price just yet.
I have a modded Virgin V+ box in our lounge but I wouldn't pay for HD viewing just yet until later on when most channels are available on HD.