I've had 10 or so nights in the iKamper 2x and am satisfied with my purchase (although it was a hard thing to throw down that much cash on a tent).
The setup is as described - very easy to put up and stow away. The aerodynamics/weight has become a big plus for me as my MPG didn't take the hit I thought it would. The ladder is a bit wonky, and I'm actually mounting it a different way due to my rack setup. I am 6' even and when running solo, this thing is HUGE for me; no issues at all with mattress size. I honestly slept almost as comfortable as I do at home (clean mountain air certainly played a role here, as well).
My coldest nights we're in the low 30's and temperature was never an issue with a couple (puffy, down) blankets. Another huge but unanticipated delighter with this "bed-like" (vs. bulkier sleeping bag) setup is I am able to flatten everything out so the bedding remains stored inside the RTT, w/ no space issues. Nice to not have to worry about that stuff everytime you move camp.
hope this helps you guys.