I'm a big fan of feedback - I have a thick skin regarding edits for readability or technical content, as discussed here.
But what about feedback on presentations? I recently had a presentation run-through with some folks who were particularly invested in the outcome of one of my talks, and the criticisms I received on my speaking skills/presentation felt more... personal, somehow.
How do you carry yourself? How do you project your voice? Can someone see your diagram labels from the back of the room? Can you get through a presentation with only a few phrases as cues, without reading from notes? Can you keep still?
I did feel a little overwhelmed with the rapid-fire commentary (fix this! try this other thing! too many words on this slide! don't fumble the laser pointer!), but I was glad to have the feedback. Besides, I knew that any questions or comments from the official audience would be a cinch after all that.