Warpig602,
The Zepps calls are first rate. Mark has been building calls and calling coyotes since, well, long before some "custom call builders" got into this sport... Mark, hand tunes his closed reeds himself. Like most manufacturers he has a lifetime warranty.
If you want to see his calls in action, check out any of his three first class DVD's that he has produced.
I note you are from Arizona, if you are near Tucson swing in on one of the Southern Arizona Wildlife Callers meetings. Ask for Eddie Hawkens, or you may run into Mark at one of the meetings. Ask to be paired with Eddie, on one of the Monthly club hunts (if you are new to calling), watch and learn..
Good hunting,
AP