X Cut is worth it, in my experience, at half the price of Stihl chain when I priced compared locally when I bought a case of 72DL. It stretches far more than Stihl chain, but my groundie handles the normal saw maintenance so it's not as big of a deal for me.
I'll check Stihl pricing next time I order more 3/8" chain.
I also order from Stahl, and have been very pleased with their service.