Last year I purchased my first ever red dot for any weapon system. I know myself enough to know that I need to try something out first, to find out what I do and don't like, so that I can eventually buy the 'correct' one that checks all of the boxes. To that end, I bought a Holosun 510C to keep the price down, figuring I would probably replace it later.
I have 3K rounds through the rifle now and have taken two carbine classes where the rifles were slammed into barricades, thrown onto the floor when empty, and generally abused, and I'm still really fond of this thing. It has held zero just fine despite the dings and scratches, the auto-brightness setting is very good and I haven't needed to manually set brightness, it works without a battery at all [even indoors] because of the solar panel, and with the shake-awake and auto-off feature I never touch the damn thing. The battery compartment is accessible without removing the optic from the gun, so no zero-shifting issues during a battery change either.
I'm not a fan of things made in China, at all. I literally thought I'd be selling this off to one of my two brother-in-laws within a few months or a year and then buying a 'real' optic. But dammit, this thing has been fabulous and will stay here until it breaks or something.