I use the Pro Ears gold. I believe mine are the predator series. Sometimes you can find them cheaper than 299, and I think I did. Yes, they are more expensive than some of the others mentioned, but I tried some of the others and though these were better. Also, you get a five year warranty.

As with all of these things, two issues (1) windy days, and (2) distance detection. Generally, I use them to locate gobblers and then take them off when I set up. Sometimes, I leave them on just to see if I can hear him coming.