Hi - My new 2011 Coupe center armrest cutout does not allow me to rest my right arm when cruising the highway so I looked at some of the solutions. The sliding armrest is really nice but it is $261 and its still too low for my taste.
I found a cheap and satisfactory solution. I purchased a tan 7" x 13" x 2" zippered center armrest memory foam pad from "driving comfort.com" for $23.00 and put an old number plate inside the bottom using the zipper. The Pad has a thick elastic band which holds it onto the existing "cutout armrest", the number plate fills in the cutout, the armrest is 2" higher than the existing one, and the tan microfiber cover looks good with my beige interior. (you can order other colors)