REar sway bar.. Are they really that good?

George, that is generally true with most cars. It will just depend on the weight balance of the car. A VW with rearengine needs a larger bar in the rear for example.
Shayne's setup it typical of a serious drag race suspension. Solid control arms, stiff swaybar, adjusable shocks. As I said, not the best for the street.
Your setup is a more serious street, road handling suspension. What brand of bars are you using?
Thanks.
Phil

 

the front is a trans am sway bar and the rear is a Hellwig.

Thanks