It just reminds me of a skylight. It seems no matter how much you caulk or tar they always leak. Do tripods have the same tendency?
I've never had a problem, but I make sure I am sinking the lag screws into a stud instead of going straight through the sheathing into the attic. You can generally get a tripod with the same leg spacing as your roof joists.
I see a lot more problems driving by with wall mounts than roof tripods. The roof mounts tend to have broken antenna elements. The wall mounts have broken masts or brackets ripped out.