I have not had to move to magnification yet. I started using EOTECH and was just stunned by how well my shot groups improved. My eyesight was getting really bad.
I have to agree with the EOTECH as a pretty good sight for aging eyes with most 5.56 platforms. The G33 magnifier (worth the expense) is a must in my part of the country and it is best to have a 7.62 or .308 platform available as well due to the wide open spaces in middle of nowhere Southwest Idaho.