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RMRs are the most ruggedly made, and if money wasn't an issue for me and I use my firearms all the time, I'd be all over it. As it is, I'm not made of money, and I only use my guns at a vanilla shooting range. With that in mind, I ended up with a couple Vortexes (a Venom and Viper) and a FastFire 3.

The former is on a rifle and on my BFR chambered in 500 S&W. For the latter, it was a more recent acquisition. I only have about 50 rounds through it, but it holds up well, along with holding zero on that gun. No issues yet. If I do, it'll be covered under warranty, so I'm not exactly concerned.

My FastFire is on .45 ACP duty. It was on a 1911, but I moved it to my FNX 45 Tac. It sits higher than the Vortex (and thus the RMR), but it works fine. In fact, it comes with a vertical white line down the middle, which is really nice for target acquisition. You can just see it through the rear sight notch. I would use the white line to match up the front sight to the top of the line on the Burris. I find it easier and better to use that than the rear sights themselves. At this point, the Burris has a permanent home. It's survived hundreds and hundreds of rounds so far, so I'm not concerned about its reliability. I've heard scattered reports of its lack of reliability, but I can assure you mine has taken up a ton of range bag and .45 recoil abuse.

All have a decent battery life, with the factory rating being on par for them. The Vortex Viper requires you to remove the sight for battery replacement, but I wouldn't worry about losing the zero. The other sights (like the Razor) do not. The Burris has a top mounted battery cover, but it doesn't take your standard 20mm batteries. It takes a 16mm battery instead (CR1632), which aren't hard to find, but they're definitely not as easy to find as the 20mm batteries. The Venom also takes a CR1632, but the Viper takes a CR2032. I hope I got that all right...

Good luck with your decision making.