Seems like Lee ran an ad for a while about a shooter using a lee loader held the world record in some sort of long range competition. In my personal experience no difference in quality, just speed of production.

Found the story but they use to run a picture of the dude and his target...

Lee Loader Rifle
For over 50 years, more shooters have chosen the famous Lee Loader for their first reloading tool than any other. They realize it is all they need for good, accurate ammunition. In fact, at one time ammunition loaded with a Lee Loader held a world record listed in the Guinness Book of World Records for more than seven years. Millions upon millions of rounds have been reloaded with the famous Lee Loader, and we expect it will continue to be a popular reloader for many years to come. It's the perfect tool for those who wish to simply try reloading, because it will pay for itself in just an hour or so.