Well, I have an Eezi-Awn Globetrotter (a folding trailer RTT) and a Baroud Space, which is shaped like the Extreme. I really like the Space because it's easy to setup....and fairly easy to put away. It will hold more bedding than the Eezi-Awn (because of the cover-size-inadequacy on the Eezi). I'm talking 6 pillows, a 12 volt fan, and a winter down quilt, bed clothes, pockets for nighttime stuff, etc. They make a bigger version of the Space now as well that is longer and wider...and maybe taller.
The Barouds have a artificial, chemical smell when you are inside. It doesn't seem to go away, but you get used to it. The Eezi is canvas, and it "smells like camping" when you are in it, which is cool. Putting up the Eezi with the vestibule walls is a pain between the cover and stakes. Putting it away is a pain. I would say it's a better-quality tent. But, it's a pain. All tent covers suck. Digging up tent stakes (for the vestibule walls) and cleaning the dirt off of them sucks. It won't kill you, but it takes time.
The light in the Barouds is very convenient and rarely needs to be charged. The "solar-powered-vent" feature is kindof a gimmick, as mine no longer works. To be fair it didn't seem to do much when it did work, so I haven't bothered to request a warranty replacement.
Speaking of warranty, PM rino here on the forum. He's with OK4WD and sells Barouds. I lost the charger for the light in my Baroud, and he sent one to me for free. Really great customer service. That, and he was one of the two most responsive overland gear retailers I have dealt with. Answered my questions, took my money, and sent me a tent. It sounds silly, but after attempting to deal with some other RTT importers, it was really great to "just buy a tent" without having to beg for information and/or service.
In short, if you move everyday, get a clamshell. Baroud makes a great clamshell RTT. If you stay at each campsite for several days, then a real canvas folding tent feels more like "camping with dad". Mainly because of that awesome canvas tent smell.
The manual labor isn't so bad for long-term campsites.
Just my two cents.