You can easily recognize a smartphone owner by the panicky way he looks for a power plug. Not so with the XP3300: its battery life is epic, allowing you to go without external juice for two weeks or so. As I work in an office much of the time, I mostly leave my phone in my bag - even at its loudest setting, the speakers freak out my co-workers due to the volume.
But best of all is its durability. I'm not a builder or an oil rig worker, although I do go out to paleontological digs fairly often. But I don't really NEED something as indestructible as this per se. However, it's so nice having a device that I can be casual about, leaving it in my bad, throwing it on the table when I get home, sitting on it when it is in my trouser back pocket, etc. Many of today's gadgets are waaay too fragile, and my motor skills aren't very good with fragile.
Internet's not much to write home about, although the turn-by-turn navigation works very well, is very precise and quick to pick up a GPS signal. As a phone (i.e., for talking and texting), its' brilliant: call quality in my device is great (and much, MUCH better than the XP3) but what most surprised me was how well they had implemented texting. I'm a happy customer.
Cons? Well, I've been unable to change the text notification tone and, as I said, a somewhat less overwhelming ringtone volume would've been nice. The camera's not great (But, again, superior to that of its predecessor).