The digitizer is actually a major advantage because it allows for palm rejection. Note that on a typical touchscreen, when you set your hand on the device, it will recognize it as an input and therefore mess up your writing. With the PE, you can rest your entire hand on the device, just like you would with a piece of paper. Also, the price for a stylus on a comparable device is not cheaper--if you look at the recently released HTC Flyer, the stylus costs almost $70. Trust me - palm rejection is totally worth the $20. I worked for almost 2 years with a tablet that didn't have this feature, and it was endlessly annoying.
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