I got the cb6000 yesterday. For me this is the first time, so it's a lot of trying out for the right sizes... For example, how do you know it is too tight on the balls...? They don't turn blue. but stay red though. A bigger ring will make it possible to escape, a smaller one is too tight. So i tries some things with different spacers.. looks like its working good,. had it on this night... and those midnight erections.... wow... you feel that haha I am not owned by a Mistress, just do some sessions with a friend sometimes. She lives 2 hours away though. She will be my keyholder, but with the plastic locks. if for whatever reason i need to break free (for example, the tube is letting go and pinches my penis..?) i can cut the lock. However, if i cut it for my own good... she won't talk to me for 6 months... So I think that is a great way of making sure it stays on. it's numbered so she can check. Anyway.. up till now it's confortable... had it on last night in the car, walking, sleeping.. worked fine.. Just some more fine tuning and we're ready for the real lock. I can imagine what it will do with your mind after a week.... i can only wait and see what happens. greetings from the Netherlands.