1. Easy to install.
2. With tight fastening, it bends the roof, which of course returns when loosened.
3. The straps hang inside the cabin just above the driver's head.
4. The sup I installed had some movement above 60km, so it probably needs another strap

Before making the purchase, I looked at both cushioned bars and inflatable ones, but in the end, I chose these specific cushions and it turned out to be a very good choice. It carried four people and full luggage, weighing 25kg, from Athens to Evia and back without any problems.
At first, there was a small leak on the roof due to tight fastening, but once it was resolved, it returned to its original state on its own, and this is where the cushion choice shows. I also added an extra strap for complete safety.