Here are a few reasons I decided to make the switch.
My first mac was a 2008 White MacBook, which I have to admit was very flimsy. I managed to scratch the palm rests within a few days of use. This lowered my overall opinion of the mac and something I had suffered with some cheaper PC laptops. I still have my White MacBook, it is used every day and is still in fairly good condition. I have since upgraded to a newer Unibody MacBook which is rock solid. The one feature I have noticed about the newer generation aluminium macs is the solid build quality of the machines. They are very strong while also being very lightweight.