Duke,
I've got a 5600, and yes, it does fit 2 people comfortably. I only use it when the wife comes along, but when she goes, so do the big comfy folding chairs, mr. heater, etc., and I still have plenty of room. It sets up quick, takes down quick, and the sides dont come in but a few inches in the heaviest wind. I've never had to anchor it becase we usually have so much snow where I'm at that I usually just dig it down a few inches and it not going to move.
However, unless you have a quad or snowmobile, I would look at one of the sled-bottom flip top shanty's. If there is any snow at all, it is like pulling a snowplow behind you, which is never fun to do.