If you have the Gamma EZ Travel this is great and holds about the same amount of balls as the canvas bag that comes with it. As a stand alone hopper I'd also give it 5 stars. Very quick and easy pick up. Can't speak for durability yet since have only used for a couple weeks but it is very well constructed.
Pros: Excellent quality and well made. Easy to use with the EZ travel cart. Removable handle was a great idea. Adding the rolling wheels help moving the basket easier. Cons: Just a bit heavy with the basket empty. Only hold 125 balls not 150.