Was very nerve racking, especially as i had contrasting info on how to do it with a Mac. But yeah sorted now. Just updating all my apps but my internet is like a snail tonight.
So far its nice, not sure its faster than the Moto X was on 4.4.4 though tbh. But it does look aesthetically nice, much prefer the way the menu and onscreen buttons now show extra menu in there too.
After you get all the apps downloaded there might be a few updates for those apps too. Give it a half day to bake in and you should sees speed bump.