The combination of thick walls and small window is going to annoy people who spend a lot of time behind SROs and even RMRs. It is really hard to be target focused when there is a thick framed, narrow aperture overlaying the area around the target…that is 2.5 feet from your eye.
I liken the ACRO’s sight picture to the mafia of the red dot world - you can try to look out but it pulls you back in…