Thanks, Setterman!
I can't personally vouch for the quality of Woodhaven calls as I haven't ever owned one. Mike seems like a smart businessman and is a hardcore hunter. Kudos to him for building his business and getting to the place where he can charge a high premium for his calls. His calls must be worth the price to a large following or he wouldn't still be in business.
However, I do know you can get at least as good of a call from custom callmakers for substantially less. What sets custom callmakers apart from calls you can buy in the store is their customer service. Most callmakers, including myself, will work with you on finding the right combo. If you don't like the call for whatever reason, you send it back for a full refund. Plus, the quality is generally better because these calls are not being mass produced. If I don't like how the call sounds or looks, I'm not going to send it to the customer.
All the makers mentioned above make quality calls. If you have a Roberts Brothers glass call that you like, then I'd recommend buying another one in a different wood. They make one of the best glass calls out there and a different wood will give you a little different sound.
To be honest, I haven't quite found a glass and crystal call combination that I'm satisfied with yet. If you don't want any of the guys mentioned above, I'd be happy to give you additional references.
I'm going to "specialize" in double-sided calls. To me, it's the most versatile type of call you can have. I currently offer double-siders in grey slate, green slate, anodized aluminum, blasted anodized aluminum and stoned aluminum. I'm not a fan of ceramic and the supply of red and purple slate has dried up and may not return. I'm still working on a glass call and crystal call combination and will offers those soon.
Also, as a side note, I'll be "launching" a new business name and logo in the very near future. I'm super pumped about the logo as it has a specific significance to hunting the mountains in this region.
If you have any more questions, I'm happy to answer them or point you in the right direction.