Trackman is spot on...and I have never used it for baseball!
I am an avid golfer (as much as possible around travel baseball) play 75 or so rounds a year. I know my yardages and how they feel with a certain club and so forth. everything from swing speed, to club path, ball speed, spin rates, length...it is spot on. there is not a doubt in my mind how accurate it is. I am certain it is a great tool and accurate for baseball as well.