I have one, somewhat unhappy with it. The manufacturer supplied a wiring diagram that was incorrect and I just haven't removed ALL of the wiring and put it ALL back in right. They have since issued a corrected one with their units. What doesn't work right is:
No true accessory position anymore. Within 30-45 seconds of when the key is turned to that position, to eat lunch and listen to the radio, all the idiot lights come on the dash, the seat belt dinger goes off, the air bag light flashes.
The run time is programmed for 15 minutes. It might run 5, it might run 20. Will not run at all in "tach-less" mode.
The buttons on the remote stick out too far. You can't put the remote in your pocket unless you want your doors to unlock and the truck to start. If you sit down there's enough contact pressure from your pants flexing or coins/keys or just your leg moving to cause all sorts of things to happen, especially if you're already driving. Really runs the batteries down with the button constantly pressed while in your pocket.
I have the new wiring diagram, just too lazy to spend 3-4 hours on it again. I just don't use it much. They now also have plug-in wiring harnesses that make installation about half. Not available when I looked. After 3 GEM modules in my sons car, he took his out. The mechanic said the remote start damaged all 3 computers. Possible I guess.
Bottom line, IMO, if you're looking, try the auto manufacturer first. If they have one for your model, that may be ok. Aftermarket? They'd have to do one hell of a sales job to get me to buy a new one. BTW, I didn't install it until 4 months after I bought it, which is exactly 30 days beyond their piddly 90 day warranty
