Not much more to say really. If you like Batman, then you'll obviously want a Batmobile! I'm sure most children would place the car above Robin on their want list (though now having a Batman & a Batmobile, the requests for a Robin have begun)
Something to watch out for it that the Batman figure we were supplied with (Thermo Attack - sold separately) doesn't fit in the driver's seat properly (more on that here). I presume the 'normal' Batman fits fine, so go for that version if you want a figure who can drive with the roof down.