I imagine it will be comparible or better than the roof on my jeep. I driver a 2015 wrangler. I have driven in temperatures from 116 to -49 (it regularly gets as cold as -40 where I live in the winter) and only once have I had any problems with leaks and it was my own fault for not re-seating...
In the past I usually have spent extra for the more luxury apointed leather interior options but I really like the idea of the rubber flooring and marine vinyl.