I should have purchased the GT kit from the beginning but I didn't. The non-GT kit is great however I did notice when I have the rear loaded with two adults at 200+ pounds plus the trunk loaded, the rear is softer over large bumps. Not unbearable but softer. Even though I am the only person in my car 90% of the time, I think the #700 springs will come in handy should I ever decide to pile people into the backseat and load up the trunk. Plus I hear the GT kit is decent for light track usage. So it should be a win win either way.