I bought the 1.83 dual core macbook expecting a real fast, reliable "it just works" laptop but my beginning experiences have been less the satisfactory. I have a 1.66 single core desktop running windows and I have experienced more crashes on my mac than the past year on my desktop. Especially when it comes to VLC and Quicktime, I constantly have to force quit these applications. Second, its not that fast. It runs and opens applications at about the same speed as my desktop. To top it all off, this thing runs real hot and the battery is good for less than 3 hours. I pray its a defect, because this laptop was really expensive for me.