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.
ďREALITY IS LIKE A STONE. TO MANY ITíS HARD AND COLD, THEY CANíT HUG IT OR EAT IT, IT ONLY FRUSTERATES THEM AND DOESNíT DO THEM MUCH GOOD. TO OTHERS ITíS STRONG AND DEPENDABLE, YOU CAN BUILD WITH IT, BUILD UPON IT, OR WORK WITH IT, ALSO USE IT TO SMASH PEOPLE IN THE FACE.Ē