I changed over to a KKM Precision barrel after 6000 rounds through the factory barrel (not because the factory barrel was worn, just because I liked the look of the KKM). The darn thing just "keeps on going". There is no noticeable wear on the slide runners. I like the idea of the Glock 36 but it would be nice if Glock actually made a full size, single stack gun out of it. That would be a good rival for the 1911A1.
My Mod 20 remains my favorite "trouble's coming" pistol. Buy me enough time to get to a rifle or a shotgun.