No pictures to post, but I have tried and own probably more than a dozen of various brands. I started out many years ago with JPoints, orginal Delta points, and have added 4 or 5 RMR's to my pile. many are on rifles, and quite a few I move on and off handguns.
Thoughts, in general. I do own, but would not buy any sight that uses set screws that need to be loosened, to make poi adjustments. Thankfully, this "technology" seems to have passed. Rain and snow and general debris from crawling around can cause problems, but most brands seem to ship with hoods, or they can be purchased. Some hoods have loops on the front that can be used with a lanyard attached to the front of a holster or even a belt loop. I modify (if needed) the tightness of the hood, so that I can flick it off with my thumb. This does not work with Leupolds, as their wide lens makes for a tight fit.
As to glass, I am a big fan of real glass. Plastic lenses on a slide mounted gun can really suck, when you get nicks from brass. No issues on revolvers. Been wearing glasses since I was 6, so I know how to clean lenses. Plastic, even when very careful will eventually mar up. Glass lenses will resist pretty heavy abuse, even the old spit and shirttail field method of cleaning.
As to lenses and colors, most sights seem to need some type of tint in the glass to help with showing the dot. I have an STS that is a dandy sight, but the small screen and heavy tint make it tough in low light. My RMR's have the light blue tint, but are not "bad", per se. My Delta Points and the one I bought a few weeks ago (the Pro), have clear glass, and no tint. Combined with the huge filed of view over all of my others makes this my favorite for a hunting gun. For my self defense/field guns, the RMR is hard to beat. They are tough little sights.
As to dot intensity....I really like to be able to dial my dots. Surely when hunting, also when doing target work. I have astigmatisms, and dialing the dot can be the difference between usable and junk. Now the harder part, dot dials. My RMR's shine in this regard. They come on automatically, and the side buttons are fantastic. part of why they go on "serious" guns, for me. The old Leupolds were awful. I do not have any real field time on my new Leupold, but the button for intensity is sort of great, and sort of awful. To press the button, you finger blocks the diode/emitter. You cannot see your adjustments, and you have to go all the way in one direction, then back to other. It will auto adjust, but like all of my other brands, it tends to bias towards bright. Too bright for low light, IMHO. This is the other reason I insist on buttons for all of my dots. My thinking on the DPP, if it makes it to a hunting gun, I will just have to start low in the morning, and adjust during the day. No big, on a hunting gun. Not my 1st choice for a 'serious' weapon. That and the fact the new Leupold is the same as the old style, in that it takes a a little time for the intensity to auto adjust in dynamic lighting changes.
James noted in another thread ditching his dot, due to dot dance. Yup, this is real. I am not convinced that the dancing dot is mechanically different than the dance that goes on with irons, but it is MORE obvious, and it will mess with your head. The size and balance of the gun seems to affect me with the dot dance. Even from the bench, my 4 3/4 FA is a rascal to keep the dot steady. My Glock 41 is much easier, as it has more weight forward balance.
As to battery doors and locations, I am in the couldn't care less camp. Yes, I have to take my RMR's off the gun to change. Every couple of years, if I wanted. They run forever. Same with Jpoints. The DPP top mount is nice, but I would put the location way down my priority list. If you can find real world numbers for battery life, you can weigh that against battery location.
Back up iron sights. I think they are a must on "social" guns. Period. They make finding the dot quick, and they are a back up. You will not get BUI's on a revolver. I have them on my Glock 41, and they work well. I practice with both. I did order the iron sight for my DPP, but the sight body is so high (compared to the rmr or Jpoint), not sure you could get them on any handgun with a crazy high front sight.
So, what do I like/recommend? I like them all, but honestly, they all do have significant differences that may make or break any one user, or application. I think is why opinions are so over the map on the subject. Probably also why I have so many different makes :^) I love the Leupold glass and screen, best of the bunch. But if I had to only pick one, certainly the RMR.
Hope the diatribe was useful,
Northern born and Southern bred