I love my iPhone 4, haha. I don't think I had any problems with the 4 that I didn't have with the other versions (but then, I've only had two versions of the iPhone, so I'm not the most reliable source on that). Just be careful with the charger, since the white outer tubing could disintegrate after a while, unless you're gentle with it. Also, if you're clumsy like me, make sure to get a protective case. They're not cheap, but they'll save you so much money in repairs and insurance.

Hope that helps? ( ° w °)