I was a big fan of the MacBook Air (both 11" and 13" models), and had both of them. The little one was for trips, because it was... little. The bigger one was for everyday use. Then I went to work for Google, and I had no reason to use the 13" model anymore, because they gave me a newer one. I still use it every day, but only for work.
I wanted a powerhouse laptop for my own tasks. I do a lot of creative work and I need a lot of storage, RAM and CPU power. And occasionally, just occasionally, I like to play games. The MBA just isn't up to gaming. I've owned the 15" MacBook Pro before, but it's just a bit too hefty for convenient carrying-around purposes.
Rather than just let my old MacBook Airs (MacBooks Air?) languish in disuse, I decided to sell 'em and get a new 13" MacBook Pro Retina. And boy am I glad I did. The new machine packs 16 GB of RAM, a 1 TB PCIe SSD drive, and has a flatly gorgeous display. I packed everything from my old MacBooks onto it and a whole lot more, including every single one of my Steam video games, and I haven't quite used half of the storage.
I did a speed test of the disk. It reads and writes data at just under a terabyte per second. HOLY CROW! That is some crazy speed. And yet the machine is still small enough that I can carry it around with my work laptop in my backpack without discomfort.
Did I mention how gorgeous the screen is? Its native resolution is 2560 x 1600 pixels, but in everyday mode it displays the UI in 1280 x 800 mode. The pixel-doubling effect makes text ultra-sharp and much easier on my aging eyes. And when I need more real screen estate for whatever reason, I can set the display to native mode. I used VNC to connect to my 27" iMac the other day and it can display all of the pixels on that much larger display with room to spare.
I can't say enough nice things about the 13" MacBook Pro Retina. It may be the best laptop ever made. Until the next one, of course.