Powerful, Complicated, Noisy
I would recommend this for a small business who does not want to store data in the cloud. I would not purchase it again and would return it if it were still in the return window.
The QNAP TS-251+ is a powerful NAS solution which probably offers more than you need if buying this for a home office; This is my fourth NAS and easily the most potent one I've owned; I bought this to replace a Mac Mini running as both a backup, file and PLEX server.
The complexity comes with a price. I am not really happy with how any of the functions work; file sharing is inconsistent across the network, user access is confusing and doesn't work correctly, the media server is finicky when dealing with thousands of folders.