Well, if i were your neighbors I would no longer like you for cutting up my tree like that.

I'm all for cutting to the property line but for Pete's sake make the tree look attractive. Tree's are meant to look a certain way. And I wouldn't want maple looking like half a tree.
My neighbors have a big tree in their front yard. We have a small crepe myrtle but last fall the parents had the boys rake our yard because all the leaves in it were from their tree. Honestly, we didn't care. But I think that's way better than shearing a tree in half that's meant to be round.