FoxPro's are good, I own 3. I also have a couple of Johnny Stewarts, a Primos, a couple of Cass Creek and a slew of mouth calls, commercial and custom and have used all to call in coyotes. Greggs' last comment is the key to success, not the 'name' on your call. To answer your question, yes, FoxPros are good calls. The one I actually prefer is the 'discontinued' 416B. You can 'self program' it.
It's not the gun, but the man behind it.
Sheriff Russell Cottle, Ret.
USMC; 1967-1970; Vietnam-'68-'69