Cat engined GP20 sits at Mid-America Car. A few years ago MNA had a trio of these leased. They had nice, big cabs, and excellent visibility. Only problem is that if you ever hit anything, there'd be a LOT of glass headed for your face.
The other marks against them is that they were Cat engined, didn't always like to start, loaded slow, went through sand quicker than an hourglass factory, and were slippery as hell and the dynamics were weak.
Also, on the conductor's side the floor wasn't raised, and the bottom of the window was probably shoulder level. You felt like a first grader on a school bus when you rode the left side.
They did shoot some sweet flames out the stack sometimes though.