As for Holosun… I really like them. I have at this point probably close to twenty and have owned around a couple dozen in total. Multiple 407Cs, 507Cs, 507Ks, Glock SCSs, 508Ts, have owned a couple 509Ts, an EPS, two EPS Carry’s, a 507Comp, and a 407A that was used for my old department’s testing since it was 2020 and supply issues prevented us from getting a sample in time. That testing included three drops on concrete from 3, 4, and 5 feet. The optic is still functional and has been mounted on a few guns since then.
As with just about every optic out there I’ve seen Holosuns fail, but at no higher rate than other optics out there. In fact, in my experience Holosuns punch well above their price. Further, I think they have driven the pistol optic market more than any other brand since Trijicon sorta made it practical with the RMR. They offer green and red retitles, multiple reticle configurations, and multiple dot sizes depending on which model one chooses. I think the 507Comp has 8 reticle choices! Since they introduced the enclosed 509T, which is a good optic, they’ve followed up with the EPS series - a phenomenal enclosed choice for duty or CCW, and I believe that at least one of the SCS series is now enclosed as well.
With all that, what is the downside of Holosun? They are made in China like our iPhones. Lots of people don’t like that… Which is fine and for them Holosun is a non-start.
Leupold originally came out with an optic called the DeltaPoint. I have no experience with it. I don’t know anyone who did. There may have been a reason for that because Leupold came out with the DeltaPoint Pro and it seems to have been pretty successful. Indeed… lots of guys from a unit in the Army that is commonly referred to as “Delta” have emerged on the scene running that optic. Rumor is they had a hand in the development. I don’t know. I do know that it is decent. I have one on an Sig M17 and a Unity Tactical ATOM Glock slide, as well as another on an offset AR mount. I’ve owned at least one other that left on the pistol I sold. I haven’t personally had any issues but I know several co workers who did… we saw several break. One went almost 40,000 rounds before mysteriously cracking the window (still worked) and then a few thousand rounds later the shake-awake stopped working, but as long as you turned it on it continued to function. The older versions with the green circuit boards had issues. The newer (I think they changed in 2021) version with the blue circuit boards seem to work much better.
Besides some issues with function in the older units, the DeltaPoint Pro suffers from serious glare in low sun angles, has a VERY high deck (you won’t be able to see your suppressor sights with it mounted regardless of the plate you use… you’d have to get higher sights), adjusts with a single button that is between the emitter and the window - which makes adjusting a bit of a pain, and even with the shake awake can eat batteries pretty quick. I think there must be some parasitic drain on the battery even when “off”. It’s also not very durable if dropped compared to the RMR, ACRO, Holosuns, and even the SRO in my experience.
I don’t consider the DeltaPoint Micro a “true” pistol optic in the same way as the rest and would not own one.
Burris has several pistol optics out now. I’m familiar with the RXS-250 (I think it’s called). I actually like it. It’s a DeltaPoint Pro footprint but with a lower deck, top-load battery, and better adjustment. I haven’t dropped them or put a crazy ton of rounds through them but they seem nice for the money.
Speaking of Burris… If you have the opportunity, look at one… especially the bottom, and then look at the EOTech pistol optic - whatever it’s called. They look VERY similar… but in spite of the fact that they are likely the exact same optic with some aesthetic changes, EOTech charges a lot more. Hmmm… That, coupled with a serious case of hate toward numerous issues I’ve had with their rifle optics and for my money I’ll always go elsewhere.
I’ve only owned one Sig optic… a Romeo Zero. It felt cheap but it worked. I replaced it with a Holosun 507K as soon as they became available. I’ve seen a bunch of Romeo 1Pros come through classes and most of the time they work well. I used an original Romeo 1 during an Sig Sauer Academy Red Dot Instructor class in 2018 and it worked fine with one exception. A single time I drew and the dot did not “shake awake”. I aligned the irons and the dot was not there. I don’t know why, but my solution at the time was to slap the poop out of the side of the gun… dot came back on and worked fine the rest of the class. Turns out violence sometimes is the answer.
I’ve seen the “lazy Sig optic” failure to wake up a couple other times in classes with the 1Pros, but they always come back on eventually, then don’t seem to have the problem again. I don’t know what to make of it. People generally have good things to say about other Sig optics but I have no experience with them.
Then there are other players who are either small, new, or targeting a “lower” quality market and I don’t have much experience with those. Swamp Fox, CHPWS, and others may be great but I have no experience with them to speak of and no real desire to move away from the proven platforms when the others don’t really offer anything groundbreaking.