If you want some balanced reviews of the PDN, check out the Newegg reviews of the Cruz Reader (another PDN clone). Most people say it functions pretty well, but you need to have realistic expectations going in.
http://www.newegg.com/Product/Produc...scrollFullInfo
At the US price of 140, it seems like one heck of a deal.
And if you're concerned about the screen (and live in the US) just go down to a Borders and play with a Cruz. They should have them on display.