I don't really know to much about my mac it is the white 13'' laptop. But I do like it. The only thing that is a huge dissapointment is that numbers is not the same as excel in the fact that it doesn't have a data analysis pack. (that I can find anyway) so for my biostats I am going to have to purchase excel for my mac.

I would say if you can go with the 15'' the 13'' is a little small for a screen size but it is very portable. My mac is fast and I love the wireless access feature. This is only the 3rd computer I have ever owned the last one was a PC that I purchased in 2002 and I would upgrade the hardware every couple of years.