How good are the alarm systems??

Hi I've ordered a 08 eos 2.0 tdi sport I was just wondering how good the alarm system was in them and do any of you have a tracker? are they worth bothering with or is it quite hard to break into them?

You might be thinking im some sort of lunatic i promise im not my OH lives in manchester (enough said) and the kids round his area decided to nick the blue dust caps off my little hyundai amica so really i dont want them touching my new car unless they have a serious death wish!!!!

all advice welcome

many thanks

Stephb xx