I got my G20 on a whim. I was looking for a G22, but LE was buying them as fast as Gaston could import them. My dealer suggested the 10mm, I said ok.
I love the 10mm, only thing better is a .41 Rem mag.
I use my G20 as my IDPA gun, and a backup while hunting.
I did buy the KKM .357 Sig bbl for it, but was not impressed by that round in a large frame.
All the other IDPA guys love the fireball it throws. 7.4 grs IMR SR 4756 under a Ranier 180gr fmj.