I did the traction bar and the Strut bar at once, which boxed in the front end. The upper strut brace requires removing the soft under cowl piece, which can be an area of concern.
Stiffened things up nicely, car turns better, and has much less flex in all conditions. Its a good upgrade, but depending on what other mods you have will affect how much of a difference you feel. Theres a whole lot of areas that flex, but it depends how far you are taking your build/what your goals are.
TB makes nice products. Their hardware on their strut bar is Zinc coated though, which rusts up, and is disappointing to me. Besides that though, the products rock.