Well I've had two STI's over the past 9 years, both with Brants in them and have never had a problem...first thing I did was to read the manual and understand how everything works....it's not that difficult. Having had cars stolen in the past, my opinion is that any device which will stop most thieves getting the car started in the first place (ie keypad code) is worth its weight in gold and far outweighs the slight inconvenience of having to punch in 4 numbers. However, these days many people seem to be too lazy to go through that process and my only words to them are "just wait until you have a car stolen and have to go through the associated anguish, financial loss and inconvenience".
Data dots, vehicle tracking systems and any other secondary anti theft devices are, in my opinion, useless since they allow a thief to remove the car and at the very least part it out or just drive it into the ground...

My 2 cents worth...

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No Subarus currently owned