I put a Holosun 507C on my Mossy 940JM Pro. You can toggle between a dot, a wider circle, or both. I usually leave it on the circle when shooting clays.
Took a bit of getting used to, but now that I’ve used it a bit, I love it. Very rapid sight picture acquisition.
Only downsides I can think of are the cost and the slim possibility that it fails at a crucial moment. If you can still see your front sight through the lens, then I suppose that’s not as critical. My 940 is just a range toy so I’m not concerned.
I’d suggest, since your 590 is optics ready and you seem intrigued, go for it! Worst case scenario is you don’t like it, then you can either sell the sight or put it on something else.