Nothing wrong with using boresnakes/ripcords as long as you understand that it shouldn't completely replace a more thorough cleaning method.
A couple of points:
Never use the wrong size boresnake in your gun. They can get stuck if they're too big or not clean at all if they're too small. If they get stuck, it can be a PITA to get them out.
Always inspect them before using. I check for frays, knots, or anything coming loose, like that brass thing at the end. If I see fraying, I throw it away and buy a new one. I tend to replace my boresnakes after 3-4 years.
They can be washed, but don't have to be washed. Boresnakes are kind of like a squeegee: they get the big obvious stuff out, but will leave behind the tiny almost microscopic stuff. I wash mine once a year.
Boresnakes can't damage your barrel or crown. Someone eventually will tell you this myth; it isn't true. I've been using them since they started selling them in all of my pistols and rifles and even shotguns and have never seen any undue wear or damage in any of my barrels or crowns. Also, I've never had one break. Not saying they can't break, but it's never happened to me or anyone I know personally that uses them. That's about two dozen people.
Hope that helps.