I have a 2010 late 11" mba base model. I'd like to get a new mba. Looked at the retina, but dang that is too heavy for me. I love my computer, but am considering a new 13". The only reason I want the 13" is for the extra battery life. Otherwise, I think I would stick with the 11" because it is so easy to bring places and is convenient when traveling. I have a mac pro at home that my wife enjoys most of the time. I'd like the extra screen size maybe 15% of the time I am working. Has anyone gone from an 11" to a 13" and regretted it? Worried that I would miss my 11".