i have limited knowledge of this, except from the brief conversation with my installer... I believe they use a copy of your keyfob and its stashed / buried behind the dash in a transponder box so the car 'sees' your key and can initiate the start.
MT cars get a clutch bypass i think and have to be left in N. (IIRC)
I have a 2011, i forgot the brand my tech sold at his shop but he had no hesitation installing it, he said its labor intensive and takes several hours, but when done properly its a non-event.
I really like the feature that enabled you to start / stop the engine from your iphone. Really cool stuff. Im going to have it done but im gonna wait till the warranty is up.