I did own a F-250, but that was a few vehicles prior to my Canyon. I do wish I got the long bed, but the short bed hasn't been a problem yet. As for the back seat room... Both my wife and kid (who's 15, and 5'11") have no problem with it. As a matter of fact, they've commented that they are surprised that there is plenty of leg room.
I bought mine around Oct 2016. I LOVE IT!!! It has the 3.6, and I get about 16mpg city, 22mpg highway. I would absolutely purchase it again. LOVE MY TRUCK!!!