I really like my 6300, it's very solidly built and the screen is really clear. Buttons have a quality feel to them and it's a nice size. The menus are typical Nokia so no nasty surprises.
The bad points, battery life could be better and the mini usb slot is very hard to open, you have to remove the back panel and then still it's a struggle. I have heard people moan about the side volume button being too stiff but I like it just the way it is!