Yes. I installed one about 6 months ago, along with a new MAF.
Immediately I noticed a difference, but that could have been due to the new MAF more than anything. Anyhow, performance is much much better. I have mine set on 9 (couldn't quite force myself to go for 10!) Most of the time I run it in Economy mode, but when an overtake is needed, flip the switch and off it goes like a scolded cat.
Easy to install too.