It was an '09 El Limited. It was all black on black. Very nice looking actually. I got rid of it because they offered me a decent trade in (customer looking for one) towards a 3 year lease.
I made the mistake of test driving a Denali and was sold on the extra almost 100hp.
One thing I must admit is that it was better made than my Denali, just not quite as many bells and whistles. It also drove nicer and the seats were more comfortable. I also liked how the rear quarter windows would open and how there was no AFM vibration. It also had a smooth shifting 6 speed transmission after I had the TCM tuned.
AAAHHHH, I miss that truck.