Quite sturdy, and the inside stays fairly dry in the rain. The wheels are a bit cheap, I wouldn't recommend using the wheels on the pavement or any rough surfaces, only on very smooth surfaces, so they are not very useful and when the case is standing up the wheels make it less stable.
Works perfect otherwise, perhaps you'd be better off buying the version without wheels. The case itself is nice and strong, clips are good. Pouch on the inside could have been bigger but it fits a set of strings, rosin, and a small carpet protector. It comes with soft padding on the inside with velcro on one side so you can move them around to fit your cello. I've added some adhesive soft padding myself on the inside on the places where the screws are mounted, those spots felt a little bit rough and pointy. Overall good case, would recommend!