Just got one today as my online Mistress insisted that I must acquire some "hardware" (as she called put it). Therefore, I went for what was known to be "the best of the best;" coming home from her vacation in a few days I think she will be pleased that I will have been wearing it all the days since we last spoke.
n.b. The CB6Ks does take some toying with to find the right fit, but once you do, it is awesome--check out the avatar/profile!
6/13 update:
sleeping was absolutely no problem at all with the CB6Ks; but man oh man...the couple of times there was some arousal, BAM! I would be hurtin' for certain'! LOL!
6/13 update #2:
Oh yeah, I meant to add the if there is a downside it is the padlock position (I think this has been mentioned before). Depending on what you are wearing it does have to potential for an(other) "awkward" little bulge...hahaha!