I had so atera bars on a VW polo and the bars were great but I did experience some leaking. But on my current car they are totally fine! So it seems a bit random and seems to depend on where the seal sits in relation to the clamp
As far as the atera bars go they are top quality, I would recommend them. I have the aero models, very secure and easy to fit
I’ve never experienced any damage, I can’t really see how that would happen with min. I don’t leave the bars on though, take them off when done.
Personally I would take a car with roof rails any day though.