Try driving across country and airing at night in a strange place. A collar light can come in major handy for a retriever trainer with more than one dog. Actually, it could come in handy for only one dog.
Yes... But would't it be nice to do both.Seems to me like it's more targeted for people who train multiple dogs at once (upland or beagle type stuff) than it is for retriever trainers. Where the Pro 500 requires you to flip a switch to change dogs, but gives you 3 levels of stim at your finger tips, the Edge makes you flip a switch (or turn a knob) to change the level of stim, but gives you control of up to 4 dogs at your fingertips.