I have one and like it for one night excursions or when I need to be more mobile and don't want to return to a base camp every night. It's also nice to have your pillow, sleeping bag, sleeping pad and toiletries always packed and ready to go and weatherproofed inside of it.
The pole system is a must have item for me, otherwise it's a bit claustrophobic when you zip it up. I prefer an insulated inflatable pad, rather than the foam they sell, if I'm sleeping on anything other than a cot, as the foam bottoms out when laying on the ground or in the back of a truck.