Summary: +1 on Synology
Details:
I have 4 Synology NAS'es of various model years from 2009 (DS109), thru 2016 (DS116), running whatever the price-break drive size of that year was. The DS116 box is different plastic and mine hums when the temperature changes, but the others have been perfect. As you might guess from owning 4, my strategy is not to purchase their 2-drive (or larger) units, but instead have off-site backup for the single drive. But many people buy the 2-drive models and run RAID1 instead. "RAID is not backup," blah blah, blah the computer experts say, but for consumer single-use, i.e. a music drive, I feel you can live with that as a simple tactic against losing all your music in a single failure. I like my way better because it covers the power supply, the location against flood & fire, my own stupidity when copying, etc. But it occasionally requires a scintilla of thought to keep updated.
My friend installed 2 WD MyXxxxx boxes in 2010 and both had drives that died. WD replaced each under warranty, but who wants to bother with a unit that starts failing during power-up? There are occasional stories about Synology Hybrid RAID5 having software bugs and problems rebuilding after a drive failure, but the only 5-drive unit (DS1511+) I installed has yet (since 2011, obviously) to have any of its HGST 3TB drives go bad, so I haven't tried it! Speaking of drives, although Hitachi Global Storage Technologies is now WD, their drives have been reliable in my DS1xx.
I don't buy Synology's "+" models for myself, because I don't need transcoding, encryption, clouds, mailhosts, or other CPU-heavy stuff, just networked storage and the iTunes and DLNA/UPnP services. But neither do I buy their "j" models, because I don't like waiting.
[[Edit: P.S. Synology tech support is crap. No, wait,... actually it's far worse than that: uncomprehending, buck-passing finger-pointing, ill-informed misleading, smelly doodoo. There must be someone there who knows what's what, but s/he is well-hidden. Just look at their support forums. So if you were the sort of B&O customer who *relied* upon your local dealership for assistance, choose elsewise. A Drobo, maybe? NetGear's support is garbage too -- at least Synology's programmers fix things eventually. If you *need* quality support, that's the one case in which I'd recommend against doing your own local library and going with a subscription service as suggested above.
P.P.S. If your love of B&O products is based upon beauty & design, there really aren't any NASes that make the grade. La Cie is the closest to good-looking, but I have no idea as to the quality of their NAS software.]]