One issue about holographic sights... If you have normal vision or are farsighted they will work OK, but those who are nearsighted or need glasses need to look through one before they buy. On a true holographic sight like the EOTech (not cheap fake knockoffs) the holographic image is projected onto the same plane as the target. Visually it's as if it is right in front of the target. This is why there are no parallax issues with a true holographic sight.
EOTech makes these sights as standard with a 1 MOA dot and a 65 MOA ring. The ring bothers some people, so EOTech also makes dot only models.
My EOTech 552 currently resides on my CMMG .22 LR AR15 (above). The 1 MOT dot and suppressor work well for low light pest control in the hay and cow barns, as well as varminting within rimfire ranges. I had it on an FAL at one time for big game hunting, but the cheek weld on that rifle was poor due to the height of the sight. Also had it on my dedicated coyote AR15, but later switched to a scope.
EOTechs come in a variety of models, with different dot display, battery and finish options (black, tan or camo). The cheapest to operate are the long battery operated models like the 552 above, which use ordinary AA cells. The CR123 battery models are more compact and leave room for folding sights or magnifiers. The 552 costs more than the 512 because it has settings for use with night vision, which most people will not need. Same for some other models. There are also a few models with bullet drop compensation reticles for 223, 308, and 300 Blackout.