Around a decade ago it was common knowledge that Eotechs were faster to use and better than Aimpoints. Just like how not very long before that it was common knowledge that the Earth was flat.
The Eotech sights use a laser to project a hologram of the reticle in the optical window. This allows for a greater variety of reticle patterns then a diode sight like the Aimpoint. Most common in Eotech sights are a 1 MOA dot with a 65 MOA circle around it. A downside to holosights are shorter battery life. Battery life on the Eotech is advertised to be about 1000 hours.
There are other variations with additional dots to function as a drop chart. There are also machine gun reticles.
For the life of me, I could not get the reticle to show up nicely in a picture. Despite how it looks in the photo, the reticle is bright and easy to see. If you focus on the reticle, you will see that it is comprised of a bunch of dots, it will appear to be fuzzy if you have the brightness cranked up. That is just due to the nature of how it works.
Windage and Elevation is easy to adjust using a coin or similar tool. Both adjustments have positive clicks and are easily accessible on the right side of the sight.
Brightness is adjusted using the up and down arrow buttons on the rear of the sight (there are some models where the adjustments are on the left side of the sight). If the sight is off, hitting one of these buttons will turn on the sight.
The Eotech will automatically turn it self off it preserve battery life. Turning it on by hitting the down button will have the Eotech turn off after 4 hours. Hitting the up button will have it off after 8 hours. Holding both buttons will turn the Eotech off immediately.
Some models, like this 553 have a NV button that will dim the optic for night vision use. While you can sorta get away with using most optics with night vision by using a dim setting, that can damage nightvision over time. NV setting reduce the brightness enough so that you will not damage your expensive night vision device.
I did some shooting with this Eotech and with a Aimpoint T-1 on the same rifle. Shooting from the bench, or rapidly engaging multi targets off hand was quick and easy with either optic. Both were fast and easy to use, but I would not say the Eotech was any faster or easier than the Aimpoint. The only real noticeable difference in use was that this Eotech 553 felt much heavier on the rifle than the T-1. Looking at the stats on them, the Eotech is about 3 times heavier. That is an additional half pound on the rifle over the weight of the T-1.
I used to be a major fan of Eotechs. But over the years I saw multiple Eotech Holographic Weapon Sights fail in various ways. Battery terminals would break, I’ve seen the prism break loose. Lenses delaminate, and reticles dimming. The biggest issue was that many Eotechs would drain their batteries even when off. I found that my Eotech 512 would drain the batteries even when off. I had to store it with the batteries removed. I felt the high failure rate of Eotech sights was damning on its own.
Turns out it gets worse. L3 was aware of issues with their like of Eotech sights, and were covering it up. L3 paid a settlement of 25.6 million dollars over this. The biggest issues they were covering up were that the sight wasn’t actually parallax free and that there could be massive zero changes if the optic was exposed to temperature changes and it turns out that Eotech sights also were not as waterproof as they are suppose to be.
Despite these persistent issues, you still see fans of Eotech sights defend them online. The most often statement in Eotech’s defense is that the Navy SEALs are using Eotech sights. I point out that the SEALs use what they are issued, are the individuals are not purchasing these out of pocket. They also have far more range time and funding so doing stuff like rezeroing before a mission or replacing batteries each mission is a non issue. But even NSWC Crane had to issue a Safety of Use Message about the Eotech warning about a 4 MOA Thermal Drift problem, fading and disappearing reticles, and 4-6 MOA parallax error. SOCOM acknowledge these sights have issues.
So if you want a known substandard sight, buy Eotech.