Have changed from the 6000 to the 6000s and not really any difference for me so far! Have had it on for about 10 hours. Does this mean I am too small for the 6000 or will the morning wood be rather painful!
I use the CB6000s. I wear it every night. In my case, I am thick so that when I start getting hard I cannot go far as it gets stuck. What it then does is move everything away from my body. Once in awhile this results in one of my balls slipping out. Only once did I wake up due to an erection but I was using a smaller ring. I went up one size in rings and down one size in spacers. I will gladly trade the occasional ball slippage for a good nights sleep and comfort. I am not looking to feel 100% secure. I can pull out of the CB but don't. If I did I would only be cheating myself.
I kept to the ring that I been wearing with the cb6000 and all is good. This morning was a touch more uncomfortable but nothing to serious so I am very happy.
I use the 2 inch Ring with my CB6000S, No spacer, and vent side holes filled in, Those holes killed me! Know its nice and smooth.