[Byte1]

Mine cost $20 installed. Not worth buying the reader/writer and the chips just to do my own. Sure, it's real easy but it was even better when the guy comes to your home and rides around with you to several gates to make sure it's placed in the optimum spot.
I like it because it lowers the wear and tear on the window motor. Get it or don't get it, but why waste your time criticizing the idea if you are not interested in trying it?
Mine fits inside the mirror housing and is mostly hidden by the mirror. What is showing, I covered with a piece of black tape that blends with the color of the mirror housing. My wife didn't even notice it.
I've seen people waving their cards around like a panicked chicken flapping it's wings, folks dropping their cards on the ground and even one that dropped his card down inside the door. I drive slowly up to the sensor and watch for the green light. I usually don't even have to come to a complete stop. There is only one gate so far that it does not work at.