Yeah, I've got a bore snake for many of my calibers. I like them just fine for quick cleaning of the barrel. Never had any problem with them failing, curious to know about YEL13's problem.
But it's nice to have the kit that is made for the rifle, if only for aesthetics. I've got a 30 cal brush & mop, but it doesn't fit the threads on the cleaning rod. I don't have the sight tool or slave pin either and a gas chamber brush would be great.