Great green optic site - Holosun HE508T-GR-X2 1x 2 MOA Dot Green Dot Sights

My first Holosun but not my first MRD site. Have not shot the site yet, just mounted it on the pistol.
Overall I like it.
I really like the Green color because it is so easy to see. The dot and circle are crisp even with my astigmitisum.
I like the 10 minute sleep time frame and the Shake Awake feature that conserves the battery. The Go-To-Sleep time is adjustable.
I was debating buying this HE508 or the larger window HE507COMP. After mounting it, I feel the window could be bigger. I probably will get the HE507COMP as well.
Some cons are:
None of the eight, #6-32 screws they sent were long enough. They only were catching three threads in my slide. I made custom length screws for my peace of mind.
The buttons are too difficult to access because they are flat with the housing and are quite small for my old hands.
The battery is almost dead when I got it. The Low Battery warning is when the reticle starts to blink. It started blinking two hours after turning it on. I hope it is a low battery and not a defective site.
IMHO....The Auto Brightness feature changes the intensity too much at one time and too abruptly. It is not a smooth linear change from one intensity to another. It does work though.