Yellow is my favorite color. I wanted yellow, but took the stealth grey. I always hear great comments about the stealth grey however they usually contain something like, "I'm glad it's not yellow!"
So I guess it varies by area of the country as to what colors are considered "cool".
I still can't believe they are removing yellow. I realize it's not a HUMMER original color, but it's come to really be a trademark of the brand.