ORIGINAL: TFOX
Cosistancy and peep rotationis the main reason for a high quality string and cable setup.
Think about this,if a peep rotates constantly from shot to shot with cheap rigging,wouldn't it make sense that the string isn't doing the same thing from shot to shot,therefore,resulting in less consistancy from shot to shot.
I will take a well built rigging of poorer material over good material that isn't built properly any day.I have seen junk strings built out of quality material and I have seen good strings built out of lesser material.The way a string is built makes a huge difference.
What TFOX said. Expanding on this a little farther most strings are made of only a few different materials these days. BCY8125, 452x, Brownell D97 or TS1 and some others. There is a difference between these materials, but not so much that most people could tell. The main difference is how they are built.
For instance I get my strings made from 8125 for a slight increase in speed. Some people say 8125 creeps, but I can tell you that it creeps no more than any other material if the string is built right. On the other hand you could shoot a factory strin made from 452X that would creep almost forever, but have an aftrmarket string made of the same material that never creeps. Again, it's almost completel a matter of how the string is built.
The biggest advantage I see in good aftermarket strings is that once they are shot in (100 shots) and the bow is tuned then the bow rarely changes tune till I replace the string. That, and no peep rotation so no tube is necessary.