Its good when it works. - Mantis Blackbeard the Auto-Resetting Trigger System for AR-15

So the concept it great but the product needs some work. Optics planet is exchanging my unit as it just stopped working after a couple of days. Based on my and what seems like many others experiences the reliability of the product isn't great. The price might be worth it if mantis offered some sort of warranty but their website just states it offers a 45 day return policy if purchased through them, not great. When it does function it is pretty good, but not perfect. The laser module has enough play to move the laser off it's initial zero but not enough to really matter, just an annoyance. The trigger reset time is usable but not fast enough, you can easily outshoot it. All in all I would buy it again as there really isn't a great alternative and it makes dry firing so much easier and way more fun.