You will definitely feel a difference in how tight the rear feels when cornering or if you are turning a corner that has a curb or hump in it. The car will feel more solid when going over it. It wont feel like its flexing a much as compared to one without.
I am running both a front and rear Speedbuilt STB and I lovem to death!
The only word of caution I mention is avoid just drilling into the strut tower to secure the brace. I would get Don Rome's brackets to add to the STB to allow them to hook upto the strut tower bolts. It will make it a lot more secure in the long run
) 
)
