Not regionals, but I like this story.

Pulled a guy into the 650 straight off of the King Airs about two years ago (some weird stuff around company that messed up our upgrade flows). The 650 is a real sports car down low, very quick acceleration and awesome climb rates.

First flight with him was a 91 repo, maybe 2K pounds of fuel on board, no pax, way below max takeoff. I remember mentally making the V1, rotate calls in my head, pitching into a climb, then looking over and going "when your head catches up with the plane, you could pull the gear up if you don't mind".