Its not a PDA, its more of a Wi-Fi communicator or a media centered PSP, without the gaming aspect.
So it is a different device all in its own, apps aren't user installable so what you see is what you get unless it comes in a firmware update.
Its good for use in Wide area Wi-Fi locations such as Malls, Colleges, Business Parks etc.
If you only have access to a personal router I wouldn't buy it. Other than its a great device but in a entirely different field from an Axim/PDA so it makes for a bad comparison.