I have the Nology PDA-DYNO which not only works better than the G-TECH but has more to offer as well. I know it was more expensive, but look at everything you get with it
http://www.nology.com/
03 Black with Nology Ignition products, K.I.T. carbon-fiber fender trim / hood scoop with handles / hood side tower caps / rear louvers / engine cover, 14 inch BulletProof Suspension powdercoated black installed by CTL MOTORSPORTS, Fox Racing Shhox, 44inch Truxus STS with 17x14 Weld Racing Wheels, Snyper brakes, Custom black bi-xenon projector headlights, Kodiak fold down steps, black grill, Pro-Fit custom black LVE fuel door, Benevento carbon-fiber dash kit, Husky Liners floor mats, MOMO shift knob / pedals, HITCHCAM rear camera, Royal Purple fluids, Cleargearz clear differential cover, Airaid intake / filter, Borla exhaust / headers, Optima Battery.