This is my third NVR now. Of course if you have different cameras and instead of opening different apps on your phone to see them individually you can use this, where you can operate and most importantly it accommodates control on all at once. Best of them all, however customer service is unprecedented. Was on hold less than 5 minutes, concrete answers and nicely setup where Riley took over remotely and did the fine tuning. Everything in on YouTube and had already set it up however there is always a kink that needs to be taken care of. I might call them again to deal with a static IP and port forwarding but again, reaching out to someone when need it is what matters to me. Thanks Riley P!I had a problem whereby my screen which showed my camera views suddenly showed black where the camera views should be. I called Amcrest tech support and Henry did a great job in understanding my problem and did not waste my time making me repeat the diagnostics I had done so far. I was sure the problem was with the new Amcrest NVR. Model NV5216. Henry told me what to do and after completing per his instructions I reset the NVR to factory defaults and added my cameras back. Now it all works like a charm. Thanks Henry and thanks Amcrest.I suspect this product is about to be discontinued in the near future as the company is putting a lot of effort into their very expensive subscription model. I am currently looking into returning this device and setting up a PC utilizing Blue Iris.The last firmware update is from 12/10/20 (today is June 2022). The WebUI requires MS Internet Explorer, which is being discontinued. The Edge and Chrome WebUi are both missing features such as video download!Great for checking in in your cameras. Useless for working with events and footage.Most of the live viewing functionality on the actual hardware is quite solid. The options are a bit hidden but existent. While the UI is clunky I quite like this part of this setup and the picture quality is fantastic. If everything else was as solid, I would be happy with this NVR.But, and this is a big but. There is no direct way to get notifications on your smart devices. The only way I found was looping it through Email notifications, IFTTT and a 3rd party service. The notification delay is excessive.Reviewing videos is also a pain. The app won't list any specific events aside of a history of app local push notifications and requires a lot of manual searching. The Web UI is also incredibly bad in that regard. Amazons Cloud Cams year old and discontinued UI is by magnitude more user friendly than the Amcrest Pro app when it comes to reviewing events and footage.We bought a 16 channel system only expecting to use 8 or 9 cameras. It worked fine for the first 8, but the 9th camera caused problems. That camera would freeze, often it was seconds to minutes behind real time, and playback was funny. In playback you could see a person cross 50 feet of space in a second, since most of the frames were never recorded.So if you want support from this company that claims to be made in america get ready for a long hassle. First you have to fill out the form online listing all your equipment, model numbers, serial numbers, etc. In a couple of days you get an email.The first thing they will ask you for is your model number, since they can't actually access the online form you submitted! Next they will suggest you do a manual camera reset. If you choose to believe this is the route to go you are expected to climb a ladder and take the camera apart to get to the reset button! Yep break the factory waterproof seal and hit a button!When this does not solve the problem you get to find out the first layer of defense is an asian based call center that does not understand anything and is just following a script. A couple of hours later they will decide you need to talk to Houston, Texas.The next call went to an indian based call center and not texas. They will want you to download an app so they can get inside your computer and poke around on the NVR box and cameras! I said no way.The next call was finally Houston, TX. This guy we did finally allow on an old computer we don't use anymore to access our system. After almost 3 hours he reset all our cameras to 1080 resolution and completely wiped out all our settings back to factory. We spent weeks tweaking every camera setting to minimize false alarms... He said that is the best that can be done and promised to try and sort something out.He has never responded again to emails. So after 5 hours on the phone, tons of emails, and we now have a system that sort of works most of the time, with terrible resolution. We can barely even make out a license plate at this resolution. If I had wanted 1080 cameras I could have spent 1/2 the money so I am fighting for some sort of solution to this problem.They claim the issue is our internet speed. We have just over 100MPS speed here. When cornered they say it is not the upload speed, but the download speed that is the issue. No where in the description of the NVR does it say this nor in the manual.If this is not enough to make you run away try sending in a couple of cameras for repair. It will cost you 15 bucks in shipping and in our case they sent back the wrong camera! Oh and the camera they shipped said made in mexico so what about that american made claim? I had to fight them over several emails before they finally admitted the mistake and am still waiting for the replacement camera. Three weeks so far and they claim the delay is due to corona...I tossed around the idea of getting Reolink system and I'm glad I stayed with Amcrest. The 5000 series is a great upgrade from the 4000 series. The noisy cooling fan issue has been addressed in the 5000 series with onboard software. The 5000 series seems to have more processing power to handle higher resolution cameras. In my opinion this NVR is a good choice for between high end and low end NVR's.