For serious use I run it in manual mode, I just dont trust a computer sensor to do what I want personally. On my .22 I leave it in auto mode and it has been good to go on all range conditions I have used it in. It still will not work well if you are in a dark room shooting into a sunny outdoor space. Or if you use a WML in a dark room.
Fwiw, taught on an east-west oriented range in New England this past week with late winter sun angles. A couple of students with Trij RMRs found the dual dot experience in the morning (sun to right front) and afternoon (sun from right rear, low) as well.
Tried a rmr and 509t early this morning and when sun was going down in New Mexico.. besides some other personal issues I have been having with dots, it has me heavily considering going back to irons for now.
I tried it again and didn't have as big of a problem. Let me try it tonight with the circle only and circle dot options. I saw your other message, a big thing for me leaning towards irons is the concealment part. The rmr on my 26 prints making the 26 harder to conceal than a p2000 with irons.
I had wondered about this with the Holosun 509T on my LTT / Lipseys HK USP 45s.
Any thoughts?