I had a chance to spend some time with this optic over the past week before throwing together this overview.

Overall, for an optic that lists at $299 and can be had for about $260, I think this optic is hard to beat. I know there is a lot of hype around the Vortex UH-1, but given the features of this particular sight I think it will give it a run for its money.

YouTube: Holosun 510C Reflex Red Dot Review

Pros:
Clear glass, wide-open and large FOV, long battery life, crisp circle-dot reticle, weight, perceived durability, included QD mount

Cons:
Solar panel/auto-brightness, some forward signature, slight (and I mean VERY slight) distortion/magnification, absolute co-witness

Nice review.

I've been VERY impressed (so far) with my Holosun HS515BU.