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I have used both the g tech pro, and the passport gt2. I actually like the display on the cheaper gt2. They are both pretty accurate, as long as you have the right lean, weight...programmed. I drive with it on the windshield all the time, and I never have to guess on how the car is performing. Also the rpm feature on the g-tech pro is useless on the srt-4, so I would save a couple of bucks.
i had one on the RT and i never found it to really work that well...but it wasnt mine..and it didnt cost me a cent...i just dont like things on my windshield