The Highlighting feature is so terrible on the Kobo Glo that I'm already in the process of returning mine to buy a Kindle Paperwhite. I can't waste my time struggling to highlight key sentences when studying for a midterm!
Here is how the Kobo Glo's highlighting system should have worked.
Scroll to the 8:10 second mark of the video to see how much easier the Paperwhite highlights sentences
http://www.youtube.com/watch?v=-ysggWiLZkk
I'm actually quite furious that this key feature wasn't upgraded for the Glo!