Junior manager here....
My first experience with feedback. It went amazingly well.
Yesterday, I gave my first piece of feedback using the model. It was positive. When I did the "may I give you feedback?" there was concern in my guy's face. Our relationship needs some work (03's scheduled for next week). The look on his face when I gave positive feedback. Priceless.
Today I gave my second piece of feeback. It was negative. A different employee was late for work, and worse, late for our team meeting. Thanks to M&M, I ignored the lateness during the meeting and afterwards, we had a 15 second catchup. During the "what can you differently?":
"Well I guess I can catch the train earlier to make sure I show up on time"
"Great, thanks. Catch you later"
I haven't stopped smiling.