I got my BB5Z-19G364-A Remote Starter kit today. It contains... 2 keys and that's it. I sent an e-mail to the dealer where I got it to ask if something was missing (something like a control module or similar). Got also the hood switch which is required.
However,I somewhat got to a page where the installation instructions were and, surprise, description for the kit is just the two 4-button keys. Reading thru the instructions, the only need you need to do is install the Hood Switch (which looks like it is done without even a screwdriver...), cutting the keys to match the original, and program them as you do for any extra key. No computer hookup or reflashing or reprogramming.
I paid US$ 201 in total for the kit and hood switch, so if true, I guess that charging US$ 500+ for the installation is kind of a rip-off.
I have not installed it yet, but I believe the instructions are clear enough (if I got the right ones...)
CORRECTION: Read thru the instructions again and you need to connect to a IDS device to activate the remote start in the vehicle.