Unless you are a little kid, the 10" spreader bar and pad is much more comfortable, in my opinion. I'll be who ever sold you the harness was trying to get rid of the 6" bar
I've got the 2004 Tabu, with a 10" pivot bar and I use the pad.
I find it very comforable, and the pad comes in really handy when you have that slip up and the spreader bar is up on your rib-cage. A good out of control wipe out can cause that, any day of the week.
Anything can happen, it's nice to have a pad.
“All the above content is my opinion and definitely should not be acted upon. The words are not a recommendation to do anything regarding any subject. I cannot and shall not be held liable for the actions of others, in any matter.” ≈V