I have the n+, some points to consider:
Pros:
*Very soft ride
*Can go very low, low enough for stance fitment
*Dampening makes a difference (unlike those 36 way adjustable ones)
*Japanese made
*Priced very well
Cons:
*No rebuild program, 1 year warranty only valid if bought from authorized vendor AND authorized installer (receipt needed for both)
*Rears really do seize up fast, my car was never driven in snow, I cleaned the threads and white lithium greased them, even with that, after 3000 miles and 13 months the rears are a b*tch to adjust
*Spring rates are great for comfort, might want something stiffer for performance.
If I could do it again, I would get Tein CST. Only because of the rears seizing up. I prefer a monotube coilover (even though most people will tell you a twintube is better for street application). If the SS/SA were monotube I would have gotten those. Thats the only reason why I went for the n+.