Hi!
Made a lot of research before getting my cameras. I´m using a hik Pir-version in garage, then 3 pieces of the Darkfighter 2135-IS-version around the house.
There is a lot of talk of spider webs, insects and so on. I had a lot of issues with false alarms on my cheaper cameras (old D-links). My goal became to get away from the night functions, and stop using IR. I tested one of the 2135 Darkfighter and I realized it fit my needs perfectly as I got some lights on my house that helps a bit. The darkfighter does not need much light in order to keep colors. In sweden there is a lot of other things to think of also. Lots of rain/snow/himidity and cold. When I succeeded with my test camera, I bought 2 more and I am about to buy my fourth one. I will never go back to IR help-light as I think to much information is getting lost (colors of clothes and cars for example).
In my cabin I run a lot of cheap cameras. One Sricam, Wanscam and three D-link 930 and a 5010 ptz. It is pretty funny that I succeeded running those indoor cameras outside in -20

.
Anyway, I will buy another Hik 2135 soon in order to cover one more side of my house. You really need to try around with the settings, but when done correctly, they work pretty well.
I would like to have better details during day as my cameras are of the 2.8 lens version and I get a lot of area covered. Was thinking of going for 4mm or 6mm but I realized I´d rather cover a big area, instead of a smaller.
I watched a lot of youtube picture/video examples of the performance. This link below made me choose the 2135 Darkfighter. As said earlier; colors are so important due to identifying people/clothes/cars (for me)
Hikvision 3MP (Darkfighter Lite) vs 5MP (EXIR) Dome
I set all my 2135 not to enter IR mode (unless it gets completely dark outside, which might happen if I get a power surge). My UPS keeps cameras running.
I have read a lot about the differences between turrets and domes. In sweden the laws regarding surveillance are pretty rough. Using a dome makes it hard for bypassers to see what way I am actually filming, which is good. This goes for burglars also. They will not know which path to choose in order to reach best angle for disabling the camera.
As I am not using IR, flies/spiders aren't really attracted to camera. When it comes to rain I would never put any camera in a way that would make rain/snow reach it.
I have seen some people fail installing these cameras with the optimal settings, claiming quality is bad. As noted before, it takes some effort getting the settings good for both night/day surveillance.
I have run my 2135 cams since summer. No real issues yet. These are the original ones, not the gray market ones. I use sd card in each camera and skipped NVR. Some cameras notify me about movements, some just save footage each time triggered. Works fine and is a simple and easy maintained solution for my purposes. SD card 16 gb and 64 gb, mixed, keeps some months of footage when only saving triggered events.
Oh, another thing. Some reviews warn about the dome cameras due to reflections and such. I have never experienced this (on the other hand, I am not using IR, and cameras are not pointing directly to sun).
Good luck with your choice!