Very convenient, reasonably accurate. The best part is it does it automatically, any compatible currency (all the major ones) will be translated to your preferred currency.

I had rated it 2 stars due to a major glitch that existed in the firefox version but not the chrome version. That seems to have been fixed and now the conversions are correct. I recommend going into options and selecting "display original price in parentheses" so it's easy to notice if there's a glitch.