I use one of these

http://www.gelert.com/products/chinook_3_tent

I'm happy with it, the only problem I've had is that I can't get it back in the bag. So what I've done is dump the bag and now tent, airbed, sleeping bags, blankets all go in one roll bag. I can put it up in the dark (important consideration) and the outer goes up first.

So far this year I've spent at least 5 weekends plus New year in it, and the next 2 weekends are going to be in it too. It keeps the snow and rain off pretty well, but I have had to use a hot water bottle the last couple of times

Daughter has the same one, and both lots of gear can go on the bike, but that is a bit of a struggle, especially in winter

Too old to die young, too ugly to leave a good looking corpse