Reloading mags is a pain. I tend to reload load enough for an entire match but sometimes (as in an intensive class) you need to reload out there. I shoot a Glock 9mm or 1911 in matches (the 22's have their own gadgets).
Thus, I use a UpLULA® for both calibers. They work just fine but need to have a solid base to work - a table or your leg (annoying).
A guy at the last match was using a SPEED BEEZ® Magazine Loader for 9mm PCC Glock® Mags 17,18,19. Interesting gadget, sort of a lever action gadget which you can hold in your hand and not need a base.
Results - it works just fine for Glock mags. However, it seized up on Magpuls. It would load one or two and then that was it. Can't see the reason why.
It's also limited to 9mm, but it's a useful gadget for the Glock mags.