I don't know what sure means, but I actually umpire baseball. High school, college, NAIA, some regional teams with ex college/Minor Leaguers so I have a little experience in being consistent, or being brutal depending on your perspective. First, it's hard to be consistent every game. You never know what a person is feeling every day or going through. That covers the non professional part mostly but also applies to pros. Second, most of the MLB umpires are highly accurate and the ones that aren't are grandfathered in to be sucky and aren't going anywhere; it's mostly merit based, but not entirely. Third, fastest pitch I've personally called was gunned at 93. I'd shudder to see these 100 mph pitches with movement. Yay LEGO!