We have the 4 for the two of us. We use Teton Adventurer XL cots and oversized sleeping bags and still have about three feet between the cots for a small table to play cards on or use as an end table. They are HUGE! They are also HEAVY and LONG. 94"x 94"x78" for the T4, the T4 Plus is twice as long! I haven't looked at the T8. But collapsed our T4 is about 8" wide x 8" deep, and 64" long and it weights 40lbs.
All that said, from the bag closed I can have the tent up in about 30 seconds and broken down and into the bag in about 60 seconds. Storage of the huge monster is the only real challenge if you have a smaller rig full of other gear, kids, dogs, etc.
My only gripe is that the fabric doesn't seem to be as strong as I'd like and I don't see it lasting for more than 5 years of "regular" use. One of the bag handles started to pull away from the bag, and one of the door ties pulled tight off. I hear this is a common complaint, so hopefully they'll address it if they haven't already.
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