A part of me would rather have a familiar old key fob (remote) in my pocket. What are the experiences of those who purchased one for their M3? How do you use it? Is it even useful? How many functions are included? The phone app is useful, and I like it. However there is a lag after approaching the car to access the door locks. I find myself pulling out my phone and waking the car up before I get to it. The key card is ingenious, but awkward at times. I'm always concerned that I will misplace it. And it has no functions at all other than unlocking the doors and making the car ready for you to hit the brake and drive away. Thanks for input and advice on this.