I got mine about 2 years ago. Ordered my kit for the 5-speed, it gets in a few days later, the shop calls Clifford, Clifford says "We don't support this kit on a manual transmission anymore." So to my knowledge, mine was one of the last legally installed by a shop, in New Orleans at least.
I don't understand it though. If it's installed correctly, as the kit is designed, it's practically foolproof. Installed properly, to remote start it, before you turn off your car, you pull up the e-brake, put it in neutral, and press a button. The headlights flash twice, you turn the key off, and the car stays running. You get out, close the door, and arm the alarm. The doors lock and the car shuts down. This way it is impossible to attempt to start the car without it being in neutral. Press a button to start it, unlock it, and get it. If you hit the brake pedal, or take off the e-brake, without putting in the key, the car shuts down.
The only way you could possibly start it in gear is by climbing in through a window or your trunk or something, without setting off the impact sensors on the alarm, putting it in gear, and climbing back out. Not exactly something you can do on accident.
Talking with the shop owner, he says the reason Clifford gave him for discontinuing the product was that people were asking their installers to bypass this safety. They were too lazy to go through the simple steps to "arm" it. Accidents happened, and they tried to sue Clifford. So if you have a friend who doesn't have to do all that for his remote start to work, you can probably thank him and his local shop for ruining it for everyone else.
Example of an accident Clifford got sued on:
Guy got pulled over by the police on the highway, and arrested. He put the tranny in gear, because he wouldn't be remote starting it any time soon, and it's safer that way... well the police officer gets the keys to make sure the car is locked. He hits the wrong button, the car jumps out into traffic, and there's a wreck.