I bought the AC Adaptor so I can read in bed at night, using Microsoft Reader, without running the battery down. Having this huge charger attachment sticking out the bottom of the iPAC is a real bother and agrivation, as it alters the "feel" of the iPAC and just generally makes me mad. I only use it when I have to, when the battery goes too far down from reading a particularly long time and I want to keep reading. Otherwise, it just collects dust. On top of it all, it isn't necessary and you can save yourself some money, as one can just use the AC adaptor for the Cradle as it is identical in every way to this item.