I think they really depend on what application you have. For instance two of my friends bought a set for their cars at the same time and we put them in that night. The 97 Maxima was considerably dimmer than the 98 tiburon with the projector headlights. The color was a bit different too, neither were as white as 93DItune's.

I believe they got them for 20 a piece with a 10 dollar rebate making them 30 a pair. I still prefer my 4300K TL type S hid's though