I like that you can create zip archives with multiple entries in less than one second! The UI looks nice too - it's clean & simple to use (at least so far). If you're looking for something quick and easy, this might be what you need. We had been using 7-Zip but found out later we were unable to extract some of our archive items from inside an application because they weren't supported by their underlying compression format. With jszipping we are able to open up all sorts of file types without having them saved as ZIP or RAR formats first.