The gain is the look of the drop, you still have the same mushy springs and shocks (if you have not addressed them) and the poor GM geometry and bump steer issues. If handling is priority try the taller Howes ball joints, and a drop spring w/ a quality shock like Bilstein. If you want it slammed, Like I do, I am doing moog springs F&R and drop spindles w/ bilsteins. It'll still handle much better and be on the ground, but to me its all about cruising low and enjoying the ride. I have other ways to carve a curve that make more sense than a GN....and naturally start miles ahead of a modded g-body.
After 2 years, I still have not done the install, due to finances (I'm in real estate) so I have not gotten every part I need to complete my set up, because my current wheel/tire will not allow a drop spindle w/o sitting them on the fender lip and not rolling at all.