I have a Synology 214se, a lower end version of the 214. I use it for pictures, movies, and general file storage. I've been quite happy with it, especially for the price (about $150, disks are extra, I used a pair of 3TB's). Firmware updates are still happening, and there are quite a few applications that can be loaded on it.
Speed is not a factor for me, but quiet and power consumption are. It's nearly silent. It also goes to sleep after about half an hour - disks spin down, and it goes to just a single blue light. But it does wake up quickly when prodded over the network, and then the files are promptly available again.
The Synology sits in my attic (it's air conditioned space), attached to a UPS. I set it and forget it.