I have and I absolutely love it! I still forget I can shift my car fast when I am driving it. I did the shifter, which if you read the forums you have seen where stock shifters break at times, I had the cables done as well as the bullock knob. It shifts great for a cable shifter, on par with the 911 I test drove the other day. When I test drove the 400 it was right on par if not better shifting. This was one of the best mods I have done to my car.
A note: I do have the 2010 NA that currently has about 25k miles on it. I have had the shifter/cables almost 6 months.