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You are right it's too big for me as a tablet, when I travel I always will take with me the MBP 15" so as a tablet I like to have smaller one
Then that makes sense. I travel with the 12" MB and 12.9" iPP in the same bag, very easy to carry around and still lighter than a single 15" rMBP. iPP is perfect companion for me as I also use it as a secondary display with Duet
 
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