Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent upgrade

There are a bunch of improvements here and there in this upgrade of the Mac OS. I love the great interface upgrades to the Finder in this version, especially the Quicklook preview function of your files, improved sidebar, and the fancy 3D dock. I also liked the enhancements to iChat, esp iChat theater and file sharing through iChat. Safari has some minor improvements here and there, and everything seems to run a bit speedier after upgrading. Stacks isn't very useful, though. The Mail application is great, with a variety of stationery templates to choose from where you can insert photos. I don't have a backup hard drive to test Time Machine but it sounds like a cool application. Overall, an excellent upgrade.