I've been wanting to add a red dot to my AR for quite some time. I've been wanting an AP H1 for a while but didn't want to drop 600 bucks yet.
There have been a lot of good reviews on the PA Micro Red Dot but for probably about 4 or 5+ months that I've known of, they have been sold out with no ETA of more being in stock.
I randomly checked PA's site today and they are in stock. Picked mine up for 95 shipped with the 1/3 co witness mount.
It is cheap enough to try it out. If you've been looking here's the link.