I'm a quite basic user : copy/past/synch (via FreeFileSync)
As far as tested it looks like little faster copy & better handling of teracopy.
Refreshing DLNA is still a real pain in the *ss. I did thought it was not working at first (8 hours at least for less than 1 To, quite a joke really), then I realize you cannot use that function other than overnight... huhu...
As for now I've only use one HDD, main feature I'd like : adding a disk for making a RAID mirror easily (thought it was obvious for a 2 disks NAS but looking the web for it is quite... freaky :p)