As the entry-level model in the Sony NAV-U line of portable GPS devices, the NV-U44 has a fairly basic feature set. There's no Bluetooth hands-free. There's no traffic information. There's no multimedia playback. For your $249 dollars, the only feature that you get beyond basic navigation is a photo viewer.
However, for many consumers, the basics are all that is needed. In this respect, the NV-U44 does a pretty good job of creating a good navigation experience without breaking the bank.