Have had this for over 4 years now and am thinking of upgrading to a new server such as a Synology DS218 or similar. Thinking of Synology as I have only used this make so far. Reason to think of upgrade - I find it is slow at times and there is buffering issues on streaming at times.
I have DS214play as well, had it for a similar time. I did try using plex on it but it was a laggy nightmare and never went to sleep. I`ve had it set up with simple shared folders which I access via wired and wireless to PS4s and TVs across the house and its silky smooth.