The only problem with cheap strings is you are back to replacing them soon if you shoot much. I believe the top of the line is winners choice, it's guaranteed not to do all kinds of things. I use a Zebra string, they have three strands wrapped one way and three wrapped another so it doesn't twist your peep. Zebra and winners choice are both pre stretched, and guaranteed not to stretch. I don't know how they guarantee it because if you shoot a lot I wold think it would have to. Strings actually are not very expensive if you replace them yourself, but if a pro shop does it for you then I think it is about 135.00 to have a winners choice bought and installed.