Well worth the money. Its nice to be able to shuffle through the parameters at ease. I like to be able to scan evrytime drive and not have to drag my laptop and tuner out to the car. I wish i had gotten two, i just didn't have enough dough at the time. With two guages you'll be able to see 4 parameters at once versus 2.
I second that. It's the one mod that I use every single time I get in the car.