I've been looking at possibly scooping up a Real Steel S6 for a while now. I just wanted to know if anyone has one here, and can bestow upon me some more info and whether they're worth the $ or not. Youtube has a few videos, but they're mostly in a language I can only guess at! The S571 I know has been well received, especially by Mr. Cleary, but has anyone had any issues with either knife?