Hi, have hd so can comment, is pricy alright but the hard drive is bigger than Sky+ boxes so you can record a lot more programs, also if you have a HDTV then you will enjoy what it's capable of, best bit about it is that all the Standard Defination (SD) channels are greatly improved via HDMI connection so all the main channels are a lot better.
If you have an existing home cinema sound setup then most of the HD channels broadcast in 5.1 which is uncomparable to stereo broadcasts, its soooo much better.
Re Sport, the world cup was jaw dropping, the difference unreal
If you do not have a suitable TV then not worth it.
I doubt Sky will ever drop the €15 HD sub