I have used a variety of these types over the years, dating all the way back to the OEG, back in 1979 (dating myself). Non-magnifying optics generally fit the same performance envelope as iron sights. They provide the eye with a fixed reference.
Their single biggest advantage is that they place the reticle in the same visual plane as the target, eliminating the need to align the front and rear sights and maintaining this alignment through the engagement. This is useful in that, under stress, humans instinctively focus on the threat. In practical terms this translates into decreased engagement cycle times.
The advantage of the EOTECH over the Aimpoint is the lack of parallax induced aiming error. Like properly zeroed iron sights, what you see is that you get. 82ndtrooper received good advice. Zero at 25m using the 25m M16/M4 zero target and you be just fine.