I've scoured a multitude of threads on this issue and encountered a litany of opinions. Does designing (for, say, the web) on the Retina display have a definite advantage or is it a pain in the arse? I would imagine for print, the Retina screen would even surpass an external montior given its pixel density. For iOS apps it would be superb too. Is this true? Would a 15" Retina put a cMBP 13" to shame on the design front?