@Megan64 First off, it’s overkill. I mean, you wouldn’t use an 18-wheeler with a 53 foot trailer and a cargo capacity in excess of 20 tons just to go food shopping? I would rather use my Toyota Corolla if all I need to haul is a couple of grocery bags, but if you want to use the biggest tool for the job rather than one that is better suited then more power to you.
Second, it’s overpriced. My T135 is about as fast, about the same size/weight, and was only half the price of a Macbook and one-third the price of a Macbook Pro. Of course, even my T135 is overkill, but it’s priced about the same as an iPad. Since I need more that the iPad can offer, I went with the T135, but the OP doesn’t have the same needs you or I do so I feel that an iPad may be better for them.
Third, if size and weight matter, the iPad is lighter. and the iPod Touch lighter still. Combine that with the fact that iOS is smoother than OS X (at least for the OP’s intended use) and the MB Pro looks like almost the worst choice possible. If I wanted internet access from something super-light, I’d use my Droid X. If I needed the same access with a readably large 13” screen, I got my T135.