I have both a Synology DS410 and a Microserver. I got my Microserver as it was so cheap. But the lack of hardware raid 5 (not one person from work has failed to give me a software raid horror story) and the hassle of getting stuff like SickBeard working, compared to how easy it is with the Synology and its web interface meant I never swapped and the Microserver is just a backup.
The micro server does make more sense really.
With FreeNas can you access and store data to / from the server from anywhere? I mean like cloud storage.