Is Retina MacBook worth the $400 premium over MacBook Air?

I'll be looking to upgrade my Early 2011 MacBook Pro 13-inch by the end of this year or early next year (whenever I have enough funds). Currently my eye is on the MacBook Air 128GB, which I can buy by the end of this month or a Retina MacBook Pro 13-inch by the end of the year (assuming they maintain current pricing and upgrade to Haswell).

My question is is the screen worth the price premium? My usage is pretty basic; mostly web browsing, lots of typing and univ work (presentations, word files etc etc). Unfortunately there is no way for me to personally check out the rMacBook to make a judgement so i'll have to rely on word of mouth.