I’ve borrowed the Thule aerobars for my car that use the heavy rubber strap to fix to the roof rails and found them a bit of a faff.
They were ok, but because the rubber is so grippy, getting them in place and removing them afterwards was a bit of a struggle.
When I decided to get my own bars, I considered the Thule ones but ended up with the Atera Signo bars from roofbox.co.uk – they were reduced from £300 to £135.
They fit much easier to the rails and feel just as secure. They were also quieter than the Thule ones.
But, you can’t buy a longer rail with the same feet if you get a bigger car for example, which you can do with the Thule ones. So, if it turns out in the future they are not compatible with a new car, there is no way of making them fit.