I have three raspberry 3B that was on OSMC / v17 october or december 2018.
All connected to a Synology Shared SQL database
I upgraded one to v18.2 alone, to update database.
Once done, I upgraded my Windows PC (I use it to manage new content) to Kodi v18, and updated the two remaining Rasp.
All went smoothly, not a single problem, HifiBerry works perfect !
So, I just wanted to say many thanks to all OSMC and Kodi team for such a great update !