I have a FF3 in a Burris dovetail mount on my G17. I am on my second one so far—the emitter cracked on my first one (I think I banged it into something) and Burris replaced it for free. Quick turnaround too, I might add.
Sig has the Romeo 3 Max that might be worth a look. The glass is supposed to be huge.
What are you wanting to do with the dot? If it’s for carry/defense, be ready to spend a lot of time practicing draws and watching the dot when you’re shooting.
I knew you'd have some experience in that arena. I'm mounting the sight on my Five Seven for fun. I'm sure I'll carry it in the woods too. No gunslinger stuff.