I own a Bushnell Holosight ...... a knock off of the Eotech.
I love it as well!
Mine is the 1 MOA dot all by itself. Right now its on a rifle (742 Rem .30-06). When I started sighting it in ....... a 1.5" group was no problem at 100 yds.
I think that 200 yds is quite feasible even for 'otes.
For handguns (thats where my holosight is most of the time) I wish mine had the standard reticle (circle and dot) like the Eotech. The reticle would be faster to find in the window. When this sight is on my Ruger Redhawk (.44) I can regularily hit golf balls at 35 yds. (with an improvised rest).
Some tips with the holographic sights: Shoot with both eyes open if you can.
Also, whether you shoot with both eyes open or one shut (or both shut like me, ha ha!) shoot the same way always.
If you switch ways it will affect your zero!
I find that I shoot best for precision with the least amount of brightness on the dot that I can still see clearly. Overly bright settings cause to much flaring and distraction.
Three 44s