I'm perhaps a bit unusual ("perhaps?", I hear you snicker) in that I don't mind flying puddlejumpers - regional jets are decently comfortable (no middle seat) and often offer much more convenient connections.
But I've never flown one over the Rocky Mountains before. If we only get half way to Denver, it's been fun hanging out with y'all.
UPDATE 21 April 2010 18:05: Bluesun in the comments was spot on - it was fine, and more comfortable than the 757 that brought me to Boston.