I have a friend who's using one of these and he said its awesome, his brother logs onto it and gets all his tv from it, very usefull if you dont have a satellite system.
He said once you have logged onto it you have full control, ie change channels etc, the thing that puts me off is the price of them.
I was looking for a good satellite meter and emailed this satellite shop in the USA, i got an email back with this fourm address and they all use them over there, the admin of the site is originally from scotland and pm'd me to see if i had a slingbox to exchange so he could watch scottish football.