Hi, i'm also new here...
But here are some tips, from me:
I have a gg 300 before the ossa chapter.
The standig position is on a ossa cleary near to a gas gas.
You have the feeling of beeing home in the bike, when you ride a gasser before.
Bikeweight and the position of the weight is not the same.
An ossa is developed on cad program.
By driving the bike you cleary feel the center of gravity is thoughtful choosen.
No bigger changes on the motorparts between a 2014 and 2015, except the needlebearings on the crankshaft.
Greetings