Just my opinion, but I have owned, used and/or heard most of em. To my ears the JS PM4 sounds every bit as good as the lower priced and even the mid priced FP's. I also KNOW it will call any and all predators every bit as well.
I've modified the receivers of the PM4's I've used so it is all enclosed in a weather proof enclosure. The modification is a HUGE, HUGE improvement over the way they are designed from the manufacturer.
As part of the modifing, I also change the antenna design/placement. I have no idea why, but it makes the PM4 caller much more reliable, as far as both range and response, than any of the FP callers not using FHSS..
I'll go out on a limb and say it rivals, and may even be superior, than the callers using FHSS when it comes to range and relabilty.
That's my story and I'm sticking to it.
Just don't overlook the JS PM4 just because everybody says get a Foxpro. The PM4 is a pretty good caller (and with a little work can be a fantastic caller)..
I better add, the Foxpros are pretty good too.