The previous complaints about rounding errors are likely not rounding errors at all; rather, merely due to the point in time when the exchange rate conversion factors were last updated (they move constantly throughout the currency trading business day). Try comparing this widget's answers to some of the other currency converters (Yahoo, CNN, etc.) on a weekend when the markets are closed and you'll see they are essentially the same...slight differences due to the converters' internal programming accuracy (CurrencyConverter promises five-digit accuracy) and/or the accuracy of the database each particular converter uses.

A valid complaint would be that the developer only allows conversion updates once per hour and you have to manually click the orange circular arrow button on the bottom left of the widget to get it to update. That's plenty good for personal use unless a currency's exchange rate is changing rapidly due to some national/international economic calamity.

Obviously for large-sum conversions, one would want to use a dynamically updated currency converter.

Memory use is miniscule and no memory leaks were noted.

I particularly like the tax feature built into this widget which lets me know what I'll be paying for an item after my credit card company adds on their 2% foreign conversion fee.