2 years, and it was 2 years old when I got it. Only time water came into the cab was a slight accident with a pressure washer. There is a tiny mod you can do to the roof frame to prevent against wear caused by lowering / raising the roof. Later models also have a glass rear window, earlier models had a crap plastic screen.
I won't tell you they never leak, but in the time I had it, it wasn't a problem.
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