So the other day, I got my very first CB. It was a CB-6000. I have to say, it's quite an experience wearing your first CB. It's definitely not as comfortable as I envisioned. It's a subtle pain that reminds you that your are locked away and cannot touch your cock. 

I found some naunces that I hadn't anticipated. Thanks to the forum posts, I had many questions answered. First, it's difficult to put your cock inside of it. Using the pantyhose method works well. Second, having tight balls really hurts. I'm going to start with the larger rings and work my way smaller as my balls stretch out. This is the recommendation of several posters. Finally, with the CB-6000 it's very hard to clean it, even with a squirt bottle. I'll probably have to clean it out once every few days by removing it. 

So far I have been using it on 12 hour basis. I have yet gone 24 hours. I think it'll take a little time before my body adjusts to it.