This NCY shock for the ruckus is of good build quality, but the spring is not much stiffer than the stock shock even with the preload adjusted to the max setting. If you weigh over 250lbs this probably wont be much better than the stock shock. Installation- will fit the Ruckus with out any major modifications, you will have to trim the rear fender to keep the shock from hitting it. The shock comes very close to the rear tire, and you may have to adjust the preload set rings to keep them from rubbing on the tire.
Even though the spring may not be as stiff as one would like, the scooter rides much better now that it did with the stock shock. The dampener does very well to keep you from bouncing around.
Overall the NCY shock is alright but will still bottom out if you are a heavy rider.