Any SAT TV signal fed into your TV will take care of the digital issue... i.e. if you have SAT TV you have no worries about this 2008 Digital thing. Same thing goes for Cable.
On the OP's question... I would agree with those who said, If you have SATTV at the house already, then it probably makes sense. If not, then you probably cannot justify it.
Personally, we like it, but we have three receivers at home, so we just pull one from the Game room and take it with us. Looks good on that 26" LCD! Camping in the fall, we find the SAT TV invaluable to watch the good football games!
We do not bother taking it with us when we have just one night planned. Two nights, then we like it.
I would love to buy a Vu Qube to take with me. Several of our camp mates have them and they are simply incredible... you can have your DirecTV set up in a couple of minutes. Literally. And much more compact than an 18" Dish. BUT... that $699 is a pretty steep price for us.
Hope this helps,
Nights camped in 2010 = 21 nights
2008 Chevy CCab 5.3L 4WD Z71
2008 FR Surveyor 291
Slpybear, Mrs Slpybear, Three Cubs