This is well built very sure it will hold up to years of use. I needed a side to pull from and the additional handle was a perfect fit. I haven't tested the load capacity, but initial tries very sure it will meet them. The three rib rim sticks quickly and the cup holds even after pressure release. I tried it on slightly curved glass and it worked as well, easily works on auto glass, windshields. It quickly pumped up only 4 or 5 needed. The rubber feels like it would work on uneven surfaces but haven't tired that. Quality product for the money