I made the Varmint al caller and it works. Foxpro gets good comments but, while I an not poor it seems too pricey. I also have a tape caller that I found on clearance, it works also, but is bulky but works. I plan on making my own tapes at some point.
Mouth blown calls can be tricky to find over the counter, but for the price of a foxpro you can buy a gazillion mouth calls. I have had the best luck with mouth blown calls.
But if I found a duffle bag full of money, I would get the foxpro, I've heard nothing but good things.
I'll admit, a video came with a couple of primos calls, and I watched it. In some of the example hunts , they used the primos electronic caller and it seemed to work pretty good.