I used a Livescribe pen as a student, and I found it really helpful. Being able to record audio and tie that to the words I was writing was incredibly useful. I also appreciated that they didn't go with the price-gouging printer/razorblade-refill model, because they allow you to print your own paper for free (as long as you have a high-quality printer).
The only thing I didn't like about the pen was that it was ballpoint - I'm oddly particular about this; I like Uniball or fountain pens, and I find ballpoint pens a bit irritating to write with.
But other than that, I didn't have any complaints with the pen - if you're like most people and don't mind using ballpoint pens, you probably won't mind the pen either.