I've been putting them up since February mainly, and as far as conditions they are all outdoors except for maybe 3-4 of them. I have Hik cameras in three US states right now, in the midwest area and will soon have them in all five states I cover. 90 of them are bullets roughly, and they are just installed on the side of buildings, sometimes in the shade under an eave, but more often just on the side of a building that does not even have gutters so no eave either.
The few domes I have outdoors are under an awning and in theory are mostly not going to get rained on directly. Just wet from fog and wind whipped rain.
I record on motion only, but they run 24/7 at business locations and they have been doing great. I have had no failures of any type, and I've not even needed to reboot a camera as of yet. I have had many more issues with my ACTi cameras, and even the few Axis cameras I have (hemispheric) have needed reboots but the Hiks have not had those issues as of yet anyway. Vivotek was a very reliable brand for me though, and I still purchase hemispheric cameras of theirs.
My biggest reason for trying out the Hik cameras was the failure rate I was getting with ACTi cameras due to apparent storm/surge damage killing them. I had a site that lost 4 ACTi cameras so I replaced them with the Hik. Two weeks later another storm hit and I lost the remaining 5 ACTi cameras but the Hiks were working fine. I replaced all with the new cameras and have had no further needs for replacement there which as surprised me.
Currently I've moved completely to Hik for my companies needs, except for license plate cameras which I still use ACTi for, and Vivotek hemispheric cams. The bigger cameras so not seem to have the issues the e series did for us anyway. I can imagine a future Hik camera filling this need for me in the future though if they can get something with a longer lens, something like a Hik version of the KCM-5611 or the B45 would be awesome.