I purchased the "Revo America Ultra 16CH 4K H.265 NVR, 4 TB Surveillance Grade HDD, Remote Access" with 8 4K cameras. Overall, I think it is a very good value, but be prepared for a few setup frustrations. Once you get past those though and have your system set up, the picture quality is fantastic at 4K. Here are a few things to be aware of:
1.) These are wired cameras, so you need to string Cat 5e or Cat6 cable from this NVR to the camera locations. They are NOT wireless. For me that is a good thing, as I don't trust wireless cameras to be as reliable.
2.) This is an NVR, not a DVR. It still records the video from the cameras, but each camera you connect to it need to be IP-addressable. Older analog cameras with BNC connectors will not work with this.
3.) REVO support has limited weekday hours. If you're trying to set this up over the weekend, you may not be able to get your questions answered until the following business day. I tried a couple web-based tickets which received sketchy answers. When I called, after about a half-hour wait on hold, the person I spoke with was very helpful.
4.) This product is their ULTRA model, which I believe to be the newest offering at the time of this writing in July 2018. But it also has very limited documentation. Be sure to get the ULTRA NVR manual, and not any of the other older REVO DVR manuals on their site. Also, the apps you will want to download all should say "ULTRA" in the titles. I mistakenly downloaded some other apps called "REVO Mobile HD" which did NOT work.
5.) I believe REVO requires you to register on their P2P Cloud service if you want to connect to the cameras remotely, like from a smartphone or tablet. I couldn't get any connection to work (and I've done alot of networking and port forwarding for other products) without registering for this. If you just want to monitor things from a wire-connected monitor near the NVR, then no worries you won't need the cloud service.
6.) Once a camera is wired and you plug it nto the back of the NVR, wait at least 60 seconds for the NVR to assign the camera an IP address. If you expect an image instantly you will think something is wrong -- just be patient and it will get there.
But again, in the end, once things were working, I am very pleased with the image quality and NVR functions.
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