You have to decide yourself. But a friend of mine did the drop in kit and I did springs, oil and emulators. We were both street riders only and neither of us could tell a difference. Then again we aren't suspension pro's and probably don't ride hard enough to know the true benefits from either. The worst part is now I will never know because as my skills have gotten better he traded his SVS in on a Busa. So no more chance to feel the difference.???