Main drain line lining, good or bad?

Hi, I have this problem with roots in my mail drain line and, surprise, surprise! try to avoid $6-8 K for replacing the pipe; found special lining (plastic sleeve that goes into the pipe) which prevent root growth, does anyone knows anything about it? does it work? will it still be possible to use the motorized snake for the main lines if case of clogging?
Any information is very welcomed!

I've seen a system that uses a hybrid figerglass lining that is steam activated. That system is and has been used to repair existing lines without digging up the whole drain system. Is this what you are looking at?

Drain Lining Coventry
http://www.basearticles.com/Article/143352/Drainage-Maintenance-Service-Coventry-for-drain-lines.html