I love both of my EOTech 551 & 552 Holographic sights. I believe when you turn either on it starts at setting 12 out of 20 settings daylight. I like it both hot / fuzzed and light and little, it just depends on what type of situation might warrant a change. I also like the 4 hours auto off on the left button, and the 8 hr auto off on the right button.
I just came back from the 100 yd range a few minutes ago blasting my 2 Bushmasters w/ 551 / 552 sights. I noticed it helped to lower the reticle setting to a fairly low level, because of the shade at my shooting location, along with the bright sun mix downrange. I had both of the sights zeroed at 50 yds a few days ago, and I did not have to adjust any setting on either, to shoot real decent into B Casy 8 in dia range pressure sensitive patches at 100 yds. These sights are the real deal at short and longer distances w/ no light relection back at you, just the spotting scopes would shine back. I also love to shoot with both eyes open, and the EOTech's allow for this with no problems for me.