I wanted to upgrade a few of my current cameras, I have had 8 of the 3mp bullets from Amcrest since 2016. Essentially I have one on every corner of my house looking across, the front face of our house is 110 feet long and we have about 50 feet of yard on each side of the house to the property line. This means a front camera was looking about 160 feet, and while I had never had any issues with the 3mp cameras I wanted to see what could get some better details. I also opted to go with the 2.8 mm lens for the larger 112 degree viewing angle. I started by getting one camera and loved the upgrade so much purchased a second within 3 day's. The photo quality is amazing, everyone I have shared pictures or videos with so far has been blown away by the quality. I record all my cameras 24/7 to my nvr, and adding the 4K cams hasn't seemed to make a major impact on storage either. Currently with my 6tb hard drive I am able to store around 23 days of constant footage, which is almost 4500 hours of footage. Nighttime IR is pretty solid as well, it was also great with the 3mp cameras so wouldn't say it's a significant step up in terms of quality, but with only two LEDs on the cameras you do not have that red ring visible around the whole camera at night which is many people do not prefer to be able to see. All in all, these are definitely worth the extra money if you are upgrading or setting up a new system. I will for sure be purchasing more to upgrade my other cameras.