I have been through several Tac Response courses with James and despite the fact that I own one I am not drunk on the Glock kool-aid.
I do, however, support his argument on the 1911 based on what I saw in several classes both his and others. Not a single 1911 Colt, Kimber, S&W, Para Ord (don't think I recall seeing an STI) tricked out or stock has made it through an intense, high volume class I have attened without issue; some being major and having the shooter switch out to another handgun.
Do I think Glock is the be-all-end-all of pistols? Absolutley NOT!!!
For whatever reason the 1911 doesn't seem to lend itself well to high volume, sustained fire or at least not on the courses I have been on. Maybe it was just coincidence or sheer crap luck for those 1911 owners on course with me but not one could finish the day without issue.
That being said, I do love the 1911 and own a Springfield Loaded Operator and plan on getting a Kimber Pro Carry II in the very near future. I think every sport shooter should own at least one 1911!
YMMV