ask and ye shall receive...
https://www.youtube.com/watch?v=hg54q0fd5iU&feature=youtu.be
it makes a difference when you are loading 8 mags at once, or repeatedly loading mags at the range...
Wow. Now that I know all I need to do is ask, I'll be asking the internet for a lot more.

The guy didn't have the same enthusiasm loading by hand as he did with the loader. Also, I think the hand loading would have been faster if he had dumped out the tray of ammo. In any case, if you are loading 4-5 25-rounders at a time, I can see where it could help some. I like shooting 10-rounders anyway and I load up one mag at a time so it doesn't help me.