Hi Randall ! I have the humps, but have only used them once. Fit is excellent, they do not marr the paint on the clamshell, and I can raise the windows and open and close the doors ( windows up ) without hitting them.
They attach to the roll bars with L shaped hooks ( not velcro ), so the windscreen does not have to be removed to install the humps. The only problem I had is they also attach to the two spots where the hard top would attach, and I scratched my car with the part that inserts into these holes
In short, there are three contact points for each of the two speed humps, one at the rollbar, one on the clamshell, and one where the hardtop would attach.
Hope this helps...
Nick