Interesting, I shall have to try it out too and see what it does for me.
Even thought the POH hadn't mentioned it prior, I had alwys finished up things in the cockpit, got my MP values, transponder to Alt, before coming back up to 100% Nr and engaging the governor. This so that while doing the previous I wouldn't inadvertantly move cyclic at 100% Nr.
I hadn't noticed an overspeed when bringing up the throttle to the 80's and engaging, but will go back and look closer.