I know it's a hot topic, but I'm thinking about getting one. Ethically, why wouldn't you use every advantage legally available to help harvest an animal? I can't use it in CO, but my KS bow will be loaded up with it.
Now, with ethics aside, it's just a cool product! My buddy has one and loves the features. I haven't tried it so can't verify but it sounds cool.
With all that said, I shoot everything from longbow to long range. I just love the sport of shooting. It may not be everyone's thing, but oh well. Don't hate the playa, hate the game!