Once again, thanks for the great responses! I'm learning a lot.
Loud callers aren't really required on these surveys because the birds we're looking for are usually just a few yards away, hidden in thick brush.
I'll be making my purchase as soon as I make up my mind.
My main concern is programming new downloaded sounds into whatever unit I end up with. I'm not much of a "techie."
Oh edit!
I just thought of another question!
If something goes wrong with the remote control on something, say, like the Spitfire mentioned above, could the unit be used without the remote?
