I bought my Z in September of '09 and just replaced the battery a couple of months ago. I noticed that pressing the unlock button on the handle did not always unlock the door, replacing the battery solved that. However, the longevity of the battery is probably because I rarely use the fob buttons to lock or unlock the doors or roll down the windows. When I exit the car I thumb the lock button on the inside of the door to the lock position out of habit and when I walk up to the locked car I'm close enough that pressing the unlock button on the door works.
If you are pressing the fob buttons constantly out of habit, your battery life will be less.
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