I was excited about the prospect of a 13" MB Pro Retina. But I'm going to say that not having upgradable memory or SSD is a huge deal killer for me (right now I have a 512 GB SSD that I'm going to throw into my new MB Pro). I can deal with carrying the extra pound around. The Retina screen isn't a big deal to me as I use an external monitor most of the time, and I wasn't really that impressed when I saw it at the Apple Store.
