I have a few of these he530 sights - Holosun He530c-gr Elite Tube Sight

As noted, I have a few of these, and yeah, just bought another. More green than red. Some are of the older design without the solar panels on the top.
To me, one of the best sights that Holosun (or anyone else) makes.
Yes...I have astigmatism. BUT, three things,
1 - Holosun does a very good job of helping us out. While still not a perfect "round" dot, if you DON'T...concentrate on the dot, I've learned that the dot's shape...is of LITTLE concern.
2 - The "Elite" version, being made of Titanium, is almost impervious to damage. A few YouTube videos, show this thing taking a LOT of abuse, and living through it with flying colors.
3 - I've learned to live with the dot shape that we with astigmatism see. If you keep the color intensity turned down, and DON"T...concentrate on the dot...over the actual target, they work pretty well.

Mike