I just put a set of Gas System X on my ST2 35, and they are fine. They came along with a bow I bought, so I thought I would swap them on the bow since I had them. But usually, JBK builds all my strings now. Jeff is a great guy, and his build quality is outstanding. He also offers a 24 month guarantee against creep, peep rotation and serving separation. The last set I had built from him were Mercury 2, and I was very happy. Mike at Catfish Customs also builds a very nice set. One time I had some strings built by SRS Archery. I reached out to him for another reason, and at the time I needed a string set. He told me he was a string builder, so I gave them a shot. They are a fantastic set, and he was cheaper than all of them.