Personally, I've used a couple sets of helmet mounted Gen 1's. They are complete garbage, unless your indoors. You may as well let your eyes adjust. Gen 3 is gnarly, and obviously expensive. I personally haven't experienced Gen 2. But I've heard Gen 3 is far superior, to the point of "don't bother with anything less". Obviously budget is going to play a factor, but steer clear of Gen 1.
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