Maybe it's cause it's the first time I've used anything like this, but unless you really like pain, I can't really recommend this piece. The cock ring is self-explanatory, but positioning your balls into the cage felt like a medieval torture device. And once I got them into place, the grip was nearly unbearable. Removing it didn't feel any better either.
I'll be looking for other ball cages, as I can't really recommend this one on good conscience to others.