I guess I will play devils advocate here, my last two sets of Winners Choice strings have been very disappointing. The servings seperated badly in multiple spots.
I have been blown away by the most recent Fuse (Hoyt) string that came on my 737. It has not stretched a bit and the peep does not turn at all.
For custom strings, there are a lot of options. I have heard good things about Vapor Trail and have had great experience from Johns Custom Strings out of Virginia.