I've tried three brands and Dogtra is the best.
I'm not sold on the GPS collars yet. The best Garmin has to offer has a 1 1/2 second delay on the GPS signal. As you guys know, a good bird dog can cover a lot of ground in a second and a half. I can see where it would help locating a dog on point, but I just can't see spending $7-800 for that.