In reply to:

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If I wanted to steal your car under the circumstances described, I would first disable the alarm. If what Lupo said earlier is correct, a screwdriver blade with a T-handle on it would do it just as quickly as a key.

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I tried it myself out of curiosity when I took off the cylinder to give the car a "clean look". Frightening...

Another thing: You need the code that you get with your original keys when you order a new one. The code is probably for the mechanical part of the key; the electronic part has then to be reprogrammed (either the car or the key; I would say it's the car)