I've been using one over six months now, no problems. I haven't had any battery problems, I ussually charge every night with heavy use, but can go two days pretty easy.
The center navigation buton takes some getting uesed to, it has a raised outside edge so you have to use a fingernail.
I run Opera mini on it with no major problems, two things I don't like are it's buried in the menu and you have to go through a lot of menus to get to it. Also you can't change the permissions, so you have to "allow" it to access every time you click on a link.
It can sound tiny sometimes, not sure what causes it, but it can be like talking in a can, bu most phones seem to have that trait anymore.
It is also a bit uncomfortable to hold, it's reall a lot more boxy that it looks, handle one before you buy it and make sure you can live with that.
I'd recomend it o anyone in a harsh enviornment, I can drop it, throw it, kick it and it WORKS! Plain and simple, it WORKS! Tht is more important to me than anything!
Hope that helps some.