@Taffer FWIW, I've had a Synology DS420+ for nearly 4 years now, populated with 4 drives.
The initial cost was admittedly significant, not going to lie, but to date I've had (almost) no complaints about it.
The DSM software is decent, easy to maintain, and everything Just Works. Could I have made my own system for less? Absolutely. But for a very neatly presented, self-contained, reliable system it works very well.