Being in IT for over 20 years, I've done quite a few camera brands in recent years. Although we are primarily IT consulting/support/MSP for SMBs (small to medium business)...we frequently work with security/alarm companies with integrating their camera systems into our clients networks, I work with a couple of security companies helping them integrate their systems into their clients networks, and our wiring guy has a side business installing cameras as he does alarms also. And..a few years ago we started doing camera installs ourselves.
So, I've worked with/installed/support a LOT of different brands of cameras, most frequently Hikvision and Honeywell, as well as other brands, even residential stuff. On top of that I've assisted a local police department in setting up a new pilot system of ultra high end military grade cameras across down, so I've seen the best of the best of the best...those things can lock onto the license plate of a car as it drives away...a half mile down the road, and you can zoom in and tell if the screws holding the license plate on are philips or flathead or hex bolts!
For the past, almost 10 years now, we've used Ubiquiti networking products more and more....starting with indoor wireless, and outdoor wireless, and I even did a 150 meg shot 6 miles across salt water ocean to an island using their big airFiber radios. We love their network equipment..and use a lot of it now, routers, switches, wireless, etc.
I know the first generation Ubiquiti cameras were not very good, I started getting interested with their 2nd gen cameras...as those got me to play with their NVR software, Unifi Video. I did a few of those installs, not bad for the price. The cameras were "OK"...but I noticed that their NVR software, and their smart phone software, was EXCELLENT. And then Ubiquiti released their Gen3 cameras....and they are quite honestly good cameras. For the price, I'd say quite comparable to equally priced Hikvision models.
They are not heavy duty outdoor grade cameras, their domes are indoors, their bullet cam is rated outdoor, and I have a few outdoor, with the additional IR lense option to beef up night power.
So the cameras are pretty good, especially considering price. Color quality and sharpness are great. Fluid motion is "decent". But Ubiquitis video software is EXCELLENT..the web browser interface does not require any plug ins. You don't even need to open/forward ports on the firewall, you can bind it to a free online account/portal at video.ubnt.com and view it from there. So that keeps your network setup simple and secure, no exposed ports in the firewall. And you can view multiple sites from that same portal. And the smart phone app...heck...that ROCKS!
The Unifi Video NVR software is FREE, you can install it on any standard PC...I have our office running on a little mini small form factor Dell, I installed Ubuntu on it. You can install on Windows if you want. You don't need to buy their NVR hardware product, but for those that don't want to build their own, that's what it's there for.
As for compatibility with other products...I know some people need that. I don't like mixing...I prefer to stay within the same manufacturers technology stack, leads to the best end user experience.
Decent cameras for the price.
Absolutely top notch viewing software for computer and phone.
And you can keep your network secured...no need to expose ports on the firewall.