I run the Bestop Safari, no drill header, jammer and tonneau. I removed my factory top about 3-4 weeks ago and it's now on the floor in a spare room staying in good condition and it's gonna stay there collecting dust all summer. I recently went up the beach camping for a few nights and on the way back on the Bruce Hwy (in slow slow traffic) we were caught in heavy rain for a few hours and it didn't leak all that much. When it rains i'm not concerned at all, as the aircon leaks more.
The rear flaps a bit, but eh - it's a jeep. I can't hear it now due to my sports exhaust anyway
And it's BLOODY quick to puton and off compared to the factory top!!!
The top sit pretty snug into the header:
There is a thread about it on JU as well
here.