I bought the trolley because it could be loaded and unloaded in the upright position.
The trolley wheels and frame are sturdy, and my Yamaha baritone fits inside with reasonable ease, but not perfectly.
It has a complicated strap system for putting it on your back if you were well over 2 m tall (!), but for most people it wouldn't be useful, and just adds weight to an already heavy bag.
The main, and crippling problem is that there are no handles for picking it up so that it can be put horizontally into my vehicle. This makes loading and unloading from a vehicle really awkward.
All in all I am disappointed with it, and would recommend instead any tough shell case with good wheels.