people think of the armrest as some kind of holy grail of interior must-haves. It all depends on your transmission and/or type of driving. I have driven manual cars with an armrest round the city, and wanted to throw the thing out the window. In it's defence, i've driven 1,000's of km's round NZ in an automatic, and it was the most useful feature on the whole car.
if you think you'll use it get one, if not, save your cash.