So I've been camping a few times in it in varying weather conditions. Here's my take:
It's a smittybilt product so I was hesitant on buying it, but after camping in it a few times, I've laid my worries to rest. I also bought the annex to go with it. The base is 3/4 treated plywood wrapped in fiber reinforced plastic. The canvas type material is thicker than traditional tents and holds heat well. (Not cavas like the kodiak tents though)
RTT Pros:
cheaper than most others
ease of deployment
included LED lighting for the inside
grab handles for easy entering
It holds up flawlessly in rain
It holds heat very well (had ice building up on it one night. with the proper sleeping bag, I was very toasty)
It's price point is very competitive compared to the others in its class
You'll be the talk of the campground if you live in an area not accustomed to these style set ups
Annex Pros:
It's BIG. I could fit a queen size air up in the bottom
back entry to access your vehicle
plenty of windows
easy to install
privacy when needed
the hold down straps are big enough to wrap around rocks or whatever if your camping somewhere thats hardpan
RTT cons:
It takes a while to dry off when it gets wet, if you're not in direct sunlight
The fastening hardware leaves a little to be desired
It's noisy in high winds
The mattress is hard to get out when your cleaning it
Annex cons:
It's designed to have the RTT ladder on the inside (That's just ridiculous. I modified mine to allow the ladder on the outside)
No bottom. No big deal, I use a tarp
It's thinner than the RTT material
Zippers have slack making it a pain in the a$$ to zip up in the dark
It doesn't do as well as the RTT in wind (even after its staked down)
All in all, I'm super happy with it. I initially bought it to top off a trailer, and still will once I'm done, but using it on top of the TJ is no problem. The kids LOVE the fact that they're sleeping on top of the jeep and it gets the wife out who is against any kind of tent camping that involes the ground (and snakes or bugs) I told her they cant climb ladders, so she's good now.
I would buy it again if I had to do it over again.