Business Growth for Startup's Freelancers and SME's

I would like to know how many SME's, Freelancers and other coaches or consultants use a business coach to help accelerate their business? Also, what is the one takeaway that has made a difference to your business if you've embarked on the assistance of a business coach? The coach could be helping with numbers and every day business, to mindset. Thank you for helping with this mini question.