Prof, opinions vary. I am totally sold on a touchscreen interface even though my PRS-900 screen suffers glare and loss of contrast. I do want a clearer screen but I also want the largest screen I can easy handle. Adding a keyboard makes the device larger than it has to be. I had dreams of a Kindle with a detachable keyboard but that costs more to make and isn't as idiot-proof as an integrated KB. So make it a touch screen without the loss of contrast. It can happen.
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