I think the Duos are really nice machines, they are so small especially for such an old laptop, and I think they look really nice too Memory doesn't seem to be a problem either, both of mine came with 12 MB for instance, which isn't bad as old PBs go. With a MiniDock you get all the normal ports too, without the size of the massive full Duo Dock, although it doesn't have any ethernet sadly. The keyboards are pretty nasty though (all old PowerBooks seem to have bad keyboards though, the 520 does too).