I have never been an EOTech guy. While I have had a couple on principle and still run one on a Tavor because it looks cool, I have always thought the reticle was too busy not to mention the battery life. After much carbine training I didn't need more than a dot to make hits with carbines and was used to the holdover. I have had dozens of Aimpoints and probably have over a dozen mounted right now to include a T1 on a duty long gun.
Then came Holosun and I started getting them for all my fun guns and I got a couple circle dot ones that are neat, but it still wasn't doing it for me on carbines.
Now that my Dept. is authorizing them, I am getting into pistol mounted MRDS and got a G17 and G19 MOS. I started with a RMR06 and was having trouble finding the dot quickly. After much work I got better but still couldn't get on target as fast as my decades of front sight training had ingrained into me. More and more dry fire helped, but I still wasn't happy...
When the 507C V2 came out I was intrigued by the beefiness, the buttons, the solar, the shake awake, although not really the reticle. I almost bought a 407C instead but then went for it just to see what would happen. I mounted it on my G19 and OMG! Within a dozen presentations I could almost instantly find the dot and get on target! All the arguments I had heard for EOTech on carbines came true instantly for me with a MRDS. My eye instantly catches the circle dot and allows for quick aiming especially up close where I am used to a flash front sight picture. Also, the dot is much crisper than the RMR06.
Now, the 507C V2 is not perfect. Indoors dry fire finds many situations where the auto brightness fails to include pointing at the TV or out bright window. Maybe these are too unique of a situation as I have not seen the issue outdoors, but it doesn't mean it can't happen. Of course, this is also an issue with the RMR06 or probably any sight using auto brightness.
Lots more shooting and training to go, but this is definitely an interesting revelation for me.
Dennis.