I have a 7" Kindle Fire I can use for web browsing that works pretty well for most things. However I have an account with My Yahoo that wants me to sign in every 2 weeks or so, and I have a hulluva time getting to the field where my password goes. I can resize, rotate, and drag, but no matter what I do it's next to impossible to get to that field. Everything else I do works pretty well although the onscreen keyboard is definitely less than optimal. A lot of tablets let you attach an external keyboard if you wish, but not the Kindle. If you're going to be entering passwords or a significant amount of data, you need to give due consideration to these things.
Is a 7 inch screen big enough for web surfing ?