I use a 10x10 Flexbow and find it a solid tent. 10min to setup solo, longest part is hammering in stakes. I heat with a diesel heater that works perfect. Two cots with gear fit just fine. Might add a vestibule to the front at some point. Been a great tent with no leaks.
I had used both the 10x10 and 10x16 kodiak. 10x10 is fine for two guys in xl cots but you need to be organized and tidy. Buddy heater on opposite side of door on tote. The 10x16 would work for three guys in cots but you would need to be organized. Did 6 days in Colorado this year with two in my 10x16 and there is a ton of room. 10x16 is also great for two guys and 2-3 kids.