I own a DS214se for years.
Previously i used to use a WD MyBook World but it's HDD failed suddenly (fortunately i had a backup).
Based on this experience i moved to a dual-HDD-Raid NAS and the DS214se was one of the cheapest option (i stuffed it with 2 WD 4TB RED).
At the beginning my DS was just used to store files (docs, pics, audio,...), but in the meantime it serves as
- DHCP Server
- DNS Server
- Audio-streaming-server for my Bose Soundtouch
- Backup/Syncing-Server for several Android devices
- several Synology packages like NoteStation, ...
- serveral other packages like Git, MySql, Wiki, ...
Everything just works!
A huge community & a lot of information is available.
A clear recommendation!