So, this is an upgrade I've considered for some time for my AR (standard fixed sight). Seems as if it would be very practical upgrade, but I haven't been able to find much info or reviews, and don't SEEM to me to be that popular... I get that a red dot eliminates the need, but electronics always have potential to fail (even the very best). Anyone here have any illuminated iron sights on their rifles? Or had some experience with them? Thoughts and input much appreciated.