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Here is my particular take.
The big advantage of color LCD's is on converged devices like the iPad that are designed to handle various types of media. It is true that some people have more trouble with back-lit lcd screens than with eInk or reflective LCD screens. That being said, the problem does not seem to be great enough to have prevented LCDs from becoming the electronic display of choice for just about everything except e-Books (where it is still up in the air).
I am not particularly taken with the ability to read in the dark of LCDs for my dedicated reader because I generally don't want to read in a very dark room (There are some exceptions like when I am putting my son to sleep, but for those short sessions, my phone is more than adequate).
The big advantage of eInk or even reflective LCD screens is how long you can read on a charge. With my Jetbook, I could get 15-20 hours of reading on a single charge when the unit was new. On a Sony PRS-505 I can literally go weeks between recharge (Depending on how much I am reading... but even steady reading will get well more than a week on a charge). So, if I have a long plane trip ahead, (say a 15 hour one), an eInk reader is a better choice than an iPad that will run out of batteries half way through the flight.
The other big advantage of reflective displays (whether eInk or LCD) is that they can be easily read out doors in more or less direct sunlight. Thus, they are a better choice for the pool or the beach than an iPad.
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Bill
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