It's a nice leap forward in terms of features and functionality. The WiBand LNB can feed 12 tuners from two cables from the dish, so can plug in to existing Sky+ setups without running extra cables. The multi-room and tablet options are great too, the ability to watch recorded content outside the home and offline is nice, as is the ability to pause a show in the living room and pick up from that point in another room or on tablet.
Price wise, at the lower end, it's more expensive for relatively little extra, but the price rises quickly and sharply if you want support for more than a single tablet and multi-room.