This thing is the bees knees, having had an RMR, AEMS, and some other great ones like the SCS I really enjoy the single dot only reason for not going for the 507c…. 1k rounds in and she’s still tight with the Glock factory plastic indexing plates and checked zero yesterday and all checks out. Definitely worth it. Got it for $220 shipped off eBay. Sight sits so low you can see the top of the irons stock in a pickle. The Front sensor helps in lighting difficulties to keep the dot at an ample level of lighting. It’s what’s the RMR has had for years but with that and a 100,000 hour life now it’s worth every penny.