This is the older model, which has since been replaced with the Kindle paper-white, but although it's refurbished, it's roughly $50 less than the paperwhite 3G. I don't know whether this model contains advertisements or not (DSE doesn't specify on website), in which case the saving could be $70 over the paperwhite.
This model has multi-touch and stuff, but no backlight and less PPI compared to the paperwhite.
old model and refurb, only $50 less than a brand new latest model? 3G is good though, but not much useful to me.