It's a matter of taste, as evidenced by the success of both eInk and LCD devices on the market. For me personally, I think the improved readability is well beyond superfluous: I regularly bring my Kindle to the beach and read in direct sunlight, a feat that's not possible with other display tech right now. Plus I can bring an eInk device with me on holiday and not worry about charging it or even packing a charger is a win in convenience.
Someone pinch me when PixelQi becomes mainstream, or Samsung does something with their Liquavista purchase, or maybe when Mirasol shows up in the market.
Someone pinch me when PixelQi becomes mainstream, or Samsung does something with their Liquavista purchase, or maybe when Mirasol shows up in the market.