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Buy that Copper over Glass from Mike Yingling and it'll become one of your favorites. Mike's copper sounds extremely good while also sounding unlike anything I've heard from the other call makers. A good thing imo.
If you hunt anywhere with a lot of humidity then stick with the crystal/glass. In my experience the metallics are to picky. When they are on they are some of the best sounding calls, but when I am sitting by a tree full of adrenaline and may be worked up from hurrying the last think I want to be messing with is a picky call that may sound like crap at that moment. Good luck in your search.
Thanks for the Input everyone, I purchased several calls from the suggestions. You guys cost me a lot of money this month in calls.