My dad has been making turkey calls for around 25 years. The only model is the slate type call. So I pretty much have been using his since I was a youngin. In the early 80's I won a open division calling contest with my dads call once in Houston and finished 3rd once and 4th once (friction division) in Dallas at the national calling contest there. Those were the only three contests I entered.
He only makes numbered/personalized calls now. I for got to mention they are all hand made too.
I can use a mouth call, but don't. We guided turkey hunts some years ago and I got used to calling for the hunters, so I never really needed to be hands free. When you've called in the number of turkey's that I have you know what you can get a way with, so hands free isn't an issue.
There is not such thing as too many guns, safes or fishing poles!