I have one for every caliber I own. I really like them. The people that built my custom AR will void the warranty if you use anything but a bore snake, or the equivalent by Otis Technologies. If I'm not incorrect, the military issues them for combat rifles. Maybe some of our members that are currently in the military can confirm that.
I too have one for every caliber I own. Its a heck of lot faster than using a conventinal cleaning kit. Great for when going on an extended hunting trip when space might be limited. I use my bore snakes weekly as I figure Uncle Sam taught me to P.M. my guns regularly wether they get used or not. I get all my guns out Tuesday nights, field strip em and clean em. Its kinda theraputic for me. Nothing like the smell of Hopps 9. I wish they made a perfume out of it so I could get my wife to wear it. ;D