I have a sky box, but don’t pay a subscription.
You can view the standard freeview channels through it (I think that’s what they are) and the series reminder still works, but you don’t get the record or HD functions or any of the new wifi applications even if you connect the box up.
Works for me as I don’t get aerial reception, have super slow broadband and had the box already. I have no idea if it would be the best solution when starting from scratch.
If I recall they did kick up a bit when the subscription was cancelled saying that I couldn’t still use the box as it wasn’t covered for warranty once the subscription was cancelled. I decided I would just use it until it broke, then figure it out from there…
EDIT – just reading the posts above… Yes for a while i did pay the £10 to have the record functions and a few extra channels. Not sure if that would mean the newer wifi stuff would work…