The roller one made by Gamma breaks too aften. I use the stand up ones and the smaller ones that are tubes. I have small ones that pick up 9, one that does 18 and the stand up models which hold 100 that I use in classes. I use the tubes with the kids mostly. But do not buy the roller one. The really big one that holds 100-150 and rolls also spinning the balls into a large basket are really cool also but not practical for me since I have to haul all this equipment to the court.