i have had a CB6000 for 2 years most of the time i have found it quite comfortable to wear, provided the rings and cage are kept lubed, one draw back for me i found the cage to be a bit to long for my anatomy mr will not feeling too comfortable in such a large cage also making peeing messy resulting in a lot of cleaning. This has put me off a little in doing chastity play.
i recently saw the CB6000S the tube is Cage Length: 2.5 inches (about 63.5mm) Cage Diameter: 1 3/8 inches (about 35mm) the standard Cage Length: 3.25 inches (about 82 mm) i also purchased KSD-G3 just for added security.
i am doing some personal trials over the xmas break which so far are going well, Mistress is interested in how they go so She hold the key
As i already had a CB6000 i purchased just the cage and the KSD-G3 from Tickleberry
http://www.tickleberry.co.uk/ the delivery was within 5 days