After seeing a post this weekend about upgrading to OSMC I decided to give it a go. For a little background, my system is this:
I have a server on the network supplying network storage as well as hosting an SQL database.
On this network I have 3x raspberry PI B rev 2 boards (all 512MB ram, 1 with 2x USB, 2 with 4x USB to help distinguish).
The original B rev 2 sits in the living room and essentially acts as the “brains” - this is the one I have the video & music sources active, it is responsible for updating the SQL database that the other 2 share via a common advancedsettings.xml file.
I had a spare 8GB 40MB read/10MB write SD card so I decided to try upgrading. I have to say, this is how I feel right now: I regret wasting my time on it.
After going through the install procedure, in which I selected English as my language. within seconds it was displaying in Swedish or something of Nordic region. It took quite a while to figure that one out, as scrolling with the mouse (with its hideous giant triangle pointer) it doesn’t not scroll through all the menu options. I eventually discovered through keyboard use the additional settings and changed it to English. Again. Ok, got that sorted.
once done. I SSH’d into the PI & copied my advancedsettings.xml to /home/osmc/.kodi/userdata
wooo hoooo - my videos are all there. But its not acting as “the brain” so I add the network share as a network point and add the 4 folders that seperate the info.
Now I have 2 copies of everything 
I decided to press ahead with that issue in existence anyway. Selecting a video for playback, I get a blank screen and sound. Excellent.
a bit of searching, I decided to omit the buffer settings etc. from my advancedsettings.xml and restart.
This got me a little further - I get one frame out of every 150 (assuming a 24fps video) so that’s one hell of a jumpy video.
I altered overclocking - back to black.
This is where I have left my forum reading and searching - Raspbmc worked “out of the box” and it works really well with some well documented, easy to follow tinkering. Time to swap the SD card back over I think and go back to my original setup. I’ll keep an eye on this project, but simply put I do not think anything below the Pi 2 is powerful enough for what is going on in the background when playing a video back. Alternatively, the setup guides require improvement to cover all the tweaks & settings that a user should follow to reach the “ideal setup” for the scenario or local or network playback across the different boards.