Keep a look out for my post on the subject, I'll bump it up for everyone.

I have the entire back of the car replaced (brakes, turns, and backup).

It looks awesome! Much brighter in all respects, and turns on/off INSTANTLY. Regular bulbs seem to light up to full brightness painfully slow in comparison The turn signals also look clear unless turned on - when they flash BRIGHT YELLOW- not the stock orangey color.

I also tried several different bulbs - most LED replacement bulbs for cars suck - but I found some that work excellent - thats the link X-fired gave above.

Overall, now several months down the line, I am very pleased with this cheap mod. I think it gives the car a little touch of elegance, as well as performance, that it otherwise wouldn't have, because you really only see the LED tail lights on expensive higher end cars like Mercedes, Cadillac, BMW, etc.