For the 13 dollars I paid for this I certainly can't complain, I'd did come with 2 sets of batteries as well as both allen wrenches needed for mounting and adjustment. It fit my Beretta APX quite well, and fits my holster just fine too. After setting it up and zeroing it out, it's stayed right where I adjusted it to so far, so no complaints there. The only reason I deducted a star was because more than a couple feet away I can't see it at all. It could definitely be brighter, in fact, Ive seen $5 keychains that were much brighter. I suppose in the dark it would be much easier to see it further away, and that is when I'd be counting on it the most. Since it mounts under the barrel I can still use my top sites in daylight conditions, so no biggie I guess. For $13 bucks I can't be too awfully picky, and it does work besides the brightness issue, so a solid 4 stars, and would surely recommend. I'll likely just use it for airsoft or bb gun, and be glad I bought it, so no harm done. When it comes to buying things like this at such a low price I feel it's very important to keep expectations realistic and reasonable. Top quality products cost top quality prices. For a decent product at a more than decent price, this won't disappoint, and like I said, comes with all you need to be up and running in no time and even a spare set of batteries. With the included wrenches it was quite easy to pop the 3 batteries in, mount it, and set it up within minutes. If nothing else, it's worth 13 bucks to make my gun look cooler, and the cats think it's "the cats meow" as well!