For awhile I tried all sorts of digital notetaking devices. Eventually I realized that pen + paper notebook was vastly superior to all of them for retention, ease of use, and cost. I am sure that, for some people, the calculation is different (for example, I have a pretty good memory and thus writing something down once is sufficient for me to recall it later) but for me, the idea of a digital letter pad eventually seemed utterly wasteful and absurd to me.