Yes. I'm using more services (VPN, torrent etc..), but CloudStation has been the main reason for using DSM.
I have 20 users using CloudStation for sharing access to collaborate work data (~40GB of data).
CloudStation is easy to setup, maintain, restore accidentally deleted data, client compatibility (Win-Mac-Mobile).
If I remember well, I had just one bigger issue - one user accidentally deleted all data, but we restored them easily by CloudStation itself.
But otherwise, 4 years with it, 2 dead HDD (hybrid raid 5 saved the day), 20 users, 10 government projects shared in team and any system issue (only one mentioned earlier.)