Ok people, I am a new member in the mac world and very excited. I do have one nagging question. On all my previous keyboards, I've always worn the plastic down on the space bar. I was wondering if the MBP keys are Aluminum or plastic and if that problem will continue to my new mac? I know this is a really nit picking question, I just want to know if I should use an external keyboard on and off to ease up off the built in one. I plan to make this baby last me. Thanks!