WOW! I JUST bought one last week. I came across male chastity device about 2 years ago and finally went and bought one. I've been trying to abstain from masturbating, for personal reasons, and have been trying out wearing this chastity device. It's called the Curve and it's almost 4 inches long inside, it's the biggest one I could fine and it seems to fit me well.
I just got it last week and I've been wearing it on and off trying to get used to it. It's pretty comfortable, once I start going about my business, I forget it't even down there. I've been holding out on masturbating for a little over a month now and still going. Hopefully this chastity device will help me stop for a while.
As far as kink, I don't really think of it as a kink but I guess it would be if that's how you use it. I'm doing it for me. So far the longest I wore it was 2 days straight. But I've had it on now since yesterday and I'm trying to keep it on for the rest of the weekend.
http://www.lpsg.com/members/plainmatt/albums/me/675355-me-wearing-the-curve-male.jpg