I just finished tuning my Mathews LX after switching to a string from Prostring Archery. Shel had a new string to me, custom made, in less than a week. The cost was also less than 48.00 including shipping. I have about 200 shots on it so far and have had zero problems. I think I gained some speed and I swear the bow is quieter when I shot it in the garage. I also have had no problems with the serving working in the roller gaurd. If you're in the market for a new string, check them out. They make a great product and you'll have money left over for some new stuff.