Just had a chance of playing with RMBP 2.3 in store, and: 1. screen is really perfect for reading texts, at least in apps with retina-support, eg. safari & preview. for pictures and videos, the improvement is not quite that drastic IMHO. 2. Rescaling is very handy and does not produce blur like the old gen MBPs. but: the whole system felt kinda sluggish! changing windows, fullscreen-mode, etc., hd-videos, etc. (This is *not* snappy, Apple!) What do you think: How much CPU/GPU power could this permanent rescaling/doubling/quadruppling/whatever eat up? Is there any retina-setting which could be regarded as more "energy-efficient" or, well, "less sluggish"? I heard that 1440 does not cost as much power as does 1920?! Would be a shame if much of the progress in CPU/GPU/RAM etc would be given away to the need of arranging pixels in view.