This synology works great and is real easy to use.
I've been using different models of Synology so far, starting with DS214se to more capable 1513 and 415 and now Synology 918+ is my primary unit.Pros:- Fantastic software.
After it was running for a week I decided to make it the repository for my Silicon Dust TV tuner's recordings, and although you have to set up a dedicated folder for that, it too works perfectly to play back recordings on all my devices.I think this is a very capable and robust NAS unit.
I have 6 total cameras I want to add to this, so that's another $200 on top of the $1200+ investment that I put into this unit and the drives to go with it.
This was my first NAS and this thing is great.
If you want to play files in 4k you will have to use a different system for the server and just use the ds218+ as a nas.
Outside of the issues i had the software support for this device from Synology is top notch and if it wasnt for there software i would have returned it and gone with building my own.
I would rate the usability of the Synology software and documentation as extremely poor.
After a few weeks using it, one day it showed my drive had a bad sector.With the bad sector warning, I didn't want to do anything and risk losing my data (I only had one disk, that's my fault on this point).Now after replacing the drive and making sure my data was secure, I scanned the old drive and to my surprise, there was no bad sector.
I formatted it and scanned it again, and no bad sector was found again.One star since the main purpose of the device is to store data and it has serious flaws.Once I received the new drive I could not just add it to the NAS, create a new volume and copy the data.