Quality! I shoot for vortex. So I am bias. But, have one (or had one on the M&P15 I sold). Great choice. All around functional. Battery's last forever it seems like. Rock solid mounting. Simple and easy to use. Apples to Oranges, does not matter. The only option I would choose over one of these, would be a trijicon ACOG. and for the price, that would not happen. I should state that there is another site, vortex makes. I am stating this because people ask why I dont like it. The spark is fine on smaller firearms. But, for me being a larger framed person I prefer having a larger optic. Spark is still quality but to me is just too small ontop of a AR.