With regard to the release and the rotary control: The pressure point and the jog dial is not as original as it is at the 6D but rather (actually exactly) like an EOS 550D - a bit crisper.
I would always order the handle again.
You can even give a battery in the handle, it is not necessarily needed 2.
Addendum:
My preserved handle smells a little plasticky, but it is absolutely not bad or disturbing! To me it would also not have noticed if I had not read it in another review.