As per title, which one would offer better performance gains and reliability??

I am looking at Heeltoe automotive, and the DC Sports are roughly $300 cheaper than the Comptech ones.

http://www.heeltoeauto.com/home.php?cat=660

However, they also state for the DC Sports that "There have also been reports of the exhaust flex pipe breaking over time and needing replacement. Be aware that this header, which it makes power and fits well, may develop a repairable leak after some time requiring a trip to the muffler shop."

Has anyone has this issue, and how much does it cost to fix?

Thanks!