I like to train to proficiency with my "A" guns, run beltfeds, hit steel at 600 yards with my precision rifle and shoot cool stuff as much as the next guy. But sometimes I train with odd guns, old guns, weapons common in other parts of the world and so on.
Part of that is becoming familar with the crappy guns of the US. There isn't much new under the sun when it comes to handgun design and operation, however, they have quirks and secrets, and that's not a bad thing to know, should you ever find yourself without your G19 and 26 and have a Tanfoglio GT 380 thrust into your hand instead.