I have a Wildlife Technologies Mighty Atom. I have killed many animals with it. The sound quality is second to none. Sound quality is what brings in the predators. Scratchy, tinny speakers wont do. I wish they had a backlit remote because I do most of my hunting at night, but a Photon Micro light solved that easy enough. It always gets a response from some predator. Sometimes not the one I am after, but even in areas where the predators are thin I can always get a response...might be a hawk, might be an owl, but I will always get something to come to me. Go to their website and check out how they do the recording of the sounds, no one else does it this way. They are all live animal recordings.
Primos is junk, do yourself a favor and scratch them off your list...you would be better off with a few mouth calls while getting the money together for someone else's brand e-caller. At least the mouth calls will always work when you go hunting. Their customer service is garbage...I had a Primos trail camera with a well known documented factory problem and was told that the best they would do is SELL me another one...junk products, junk company.