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I think there is a flaw, either by design or limitation, with the pw2.
The screen is yellower, but the LEDs are white as in pw1. This means that in bright light, there is more ambient light reflected from the screen than emited from the LEDs, so the screen looks yellower / warmer. In low light or dark room, the light is predominantly from the LEDs, so the screen is less yellow / more blue / cooler. Practically speaking, what this means is the screen is warmer during the day and cooler at night. But this is just the opposite of optimal. What you want is a cooler screen during the day and warmer screen at night. There's a reason you don't install flourescent light in your bedroom. There is also evidence that there are health benefits of using warmer light at night.
What they need to do is make the screen neutral gray and coat the LEDs to make the light yellow. This way, during the day, the screen will look whiter and at night it will look warmer.
As it is, if you have an especially yellow screen, then at night, it will look nice and warm, but in the day it looks too yellow. If your screen is more beige, it looks fine for day but too blue and cool at night.
Also, I imagine it's easier to control the LEDs production to give you consistent color whereas the eink screen has too much variance. I've seen three pw2 and they are three noticeably different shades of yellow.
Ps: I realize I can make the screen whiter in daylight by cranking up the kindle light, but if I want to read on a glowing screen I'll just use my iPad.
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