You can't get better at something without feedback. However, most of it is amateur — including what often passes for feedback at work.
Feedback you get on the Internet from people you don’t know (and most Internet content) is not pro.
Comments that get back to you from third parties, is not pro. Would you accept a medical diagnosis from the colleague of a colleague who never attended medical school?
Professionals seek feedback from people who are able to help you (because they do what you aspire to do). That intimate clan of pro’s may or may not include your boss. For more see http://mixonian.com.
Your leadership becomes more strategic and inspiring.
Speak Up: Develop Your Executive Presence & Leadership Communication Style