I have SKY and Iam considering spending £150 on a SKY HD box but I want to know what its upscaling qualitys are like?

does anyone on these forums have SKY HD and can comment on its upscaling of channels like BBC1,2,3, ITV, Ch4, 5, SKY 1,2 etc

I know you can pay extra £10 month to activate a couple extra channels BUT the HD movies and HD sports channel you have to pay extra for... we have all but News, Movies and Sport

ALSO what is the USB and Ethernet on the back of the SKY HD Reciever for?