Just got my cb6000 this weekend and all i can say is wow. My lady locked me in it yesterday and have been if for 24 hours. I have to say this is my first restraint and i loved it. It was very comfortable once on but getting on was a different story. with the diamiter being so small i had a hard time getting in completly. pinched alot of skin and took time but got it on and locked. Had to play around with the different sized rings and spacers to find the right one. I have been told the my girl is going out of town for 6 days and that i am to wear it the entire tiem while she holds the key.... can hardly wait...Look forward in having the 6000 on many days to come.....