i will be buying another oneGot this because I heard good things about it. Has clear glass, easy to see and it works great so far. Cheaper than others, but still is good qualityGood value. Holds zero pretty well, parallax shift is fine for what you're paying. Wouldn't put on anything larger than 10mm though. In hindsight I would've gotten a green dot, not red.Today was the first day I was able to use it, but it still needs some fine tuning. It quit working while shooting at the range and came on intermittently after. The problem was resolved after remembering I didn’t put lock tight on the mount screws when I mounted it on the gun a few days ago. The screws had loosened up allowing the battery to make sporadic contact. Problems fixed, it works great and I’m waiting on a laser bore sight to get it close as the inside of the shooting range must have been over a hundred degrees.9/19/2022Returned the RDS got a manual dim model with physical button and has worked great.CON: Somehow the button on the inside rubbed off, there was nothing physically touching the butting but my skin. Beware of the buttons I guess. Pretty disappointed hopefully Swampfox can do something about it other wise I’m back to square one. The electronics are exposed to body moisture or any other moisture now.7-13-2022Mounted on a Springfield HellcatOut of the box:Great looking sight, all the tools and screws you could need for majority of slides it will fit on.Install:Installing unto a Springfield Hellcat was a piece of cake. You get the screws, tools to put it on. All you will need is loctite.First day i received it, I immediately proceeded to install it. That same night, it was sighted in and it was good and held its zero well. I then went to do dry fire laser practices indoors to adjust to the optic and test the automatic brightness. It was during this time I realized it did not fit my needs for this gun that I EDC and rely on as a home defense tool. In low light the dot became so dim it could not be picked up. For this reason I cannot recommend this product, IF you even think you will need it during low light conditions.NOTE: I AM PICKING NEW BATTERIES UP TO TRY AND ALSO EMAILED SWAMPFOX IN CASE I GOT A BAD SENSOR OR PRODUCT. I WILL UPDATE REVIEW IF THIS IS A SIMPLE BATTERY ISSUE OR A FAULTY UNIT.I do like this sight; however, the red dot isn’t as solid as the ones on my other guns but the price point is great and it fits my Hellcat perfectly without having to use a adapter plate. It definitely does the jobI originally ordered the auto brightness version and wasn't happy with the brightness level (it's very dim and I wouldn't recommend it) customer serviceactually responded to me on a Sunday and helped me out. Swapped it for the manual brightness and I'm much happier with it. These are great dots but I would stay away from the manual brightness model.I have this on my Glock 43x with a true precision slide. I love this it. I have a hex wasp on my hellcat and I hate it. The hex wasp works when I change the batteries. But I have to put new batteries in it every time I take it out of the safe. This is my go to optic for for this footprint. The only thing I don’t like about my sentinel is that it does not have a rear sight cut. But suppressor height sights are cheap.