I have big hands, so I find typing on small devices to be hard by default.
However, I find that typing on a Samsung Galaxy SII to not be so bad when it's turned horizontally to have the Qwerty onscreen keyboard with bigger buttons. Plus, you could always download a different style onscreen keyboard app to use instead that may better work with you.
Browsing is about the same as any other smartphone as well.
Hope this helps some.