Recently my boyfriend and I used the CB6000S and we had to return it because it was not the right fit for the ring mostly. We are ordering a cage currently and are a little concerned because the diameter of the cage is almost a centemeter smaller. The cage on the old model didn't feel uncomfortable however because of the style of the cage, there was some skin poking through the holes until he was completely flaccid. This new cage is metal stainless steel cage design, not plastic. I'm asking anyone out there if the smaller diameter is better or worse? Please let me know!