Sig Sauer ROMEOZero Reflex Sight, 3 MOA Red Dot, Black SOR01300

The good: A 3 MOA dot is my favorite and this one is very crisp and clean. The dot can also be very bright. Out of 8 settings I find setting 5 is generally good in most conditions. The lens is clear and doesn't show any reflections from the emitter. The window is surprisingly generous despite the small size. The bad: It's a polymer housing and a plastic rather than a glass lens. I'm not particularly convinced that it's very durable, though I think it would hold up to general use fine. The lens being plastic scratches easily. I am cleaning it with lens wipes, lens cleaning spray, and compressed air and after a half dozen cleanings I already have a handful of horizontal scratches. They don't distract from using the dot as of now, but in the right light they are visible and my concern is over time you'll essentially have a bur on the lens that will impact usage. One possible way to avoid this would be to keep cleaning to a minimum, but the brightness adjustment button is placed such that you often end up hitting the side of the lens facing you with your finger, meaning you then need to clean the lens. The windage and elevation adjustments do not feature clicks. You rotate the hex wrench and it sort of jumps along in positions. This can make fine tuning the dot somewhat difficult. For those concerned about durability, you can get a metal shroud from SIG customer service if you call and ask. I think this is generally a good idea, but one problem noticed with this shroud is that it ends up raising the rear sight notably because the shroud goes under the optic. This means that if you decide to or need to use your irons, your POI is notably above your POA. Frankly I wouldn't buy this again. I think the 407k/507k options from Holosun are better. With those options you get an aluminum housing, a glass lens, click adjustments for windage and elevation, and a side feeding battery that won't require you to rezero the optic when you replace the optic. If you don't want to spend the money on the 507k, the 407k can be found for $220 when it's in stock. To me those features are definitely worth the ~$60 price difference.

My Romeo Zero works well. It is mounted on my 365 X-Macro. The sight took a lot of adjustment to get on target. It is a little difficult to turn on. Between the location of the button and clumsy fingers it is difficult for me.

I purchased this unit for my Sig P365. As Bob Smith pointed out, the brightness controls are poorly positioned and you need an Alan hex key to adjust the brightness without smudging the plastic lens. Also you cannot change the battery without having to remove the red dot from your gun.I wound up selling this unit and bought the Holosun. For those two reasons mentioned, I don't like the unit and cannot recommend it.

Works great on my Springfield Hellcat OSP, I put it on on January 10th and have never turned it off and still working great Battery life is 2 years by them, 6 months so far . Will update when I have to put in new battery.