I liked both, however, R wing is not as good as it does block your rear view visibility. Which, R wing had a clean view behind you. I so far didn't have any cop pulling me over around here due to the wing.
I loved the rooster tail the GT wing creates when I drive in rain.
I have a cheap R wing for sale, you must have seen it at Arnon's house... I have the Socery Wing now... here're the pics.
No need to go all out as someone else suggested... however,
the bottom piece add the structural stiffness of the wing, without it, I could see the wing vibrate at 70mph+... The problem is the bottom piece had the worst fitment I've seen to date as far as nsx parts go. Kind of funny to me, as the GT wing itself is with v. high quality. If you have seen the J's racing wing on S2k, or Vortex wings on Sti/evo. This is the same quality if not better.
Ravi had the same problem with his Sorcery too, and he had a good remedy nip/tucking it.