IMHO K2 ROCKS. I'd highly recommend you get your hands on the tutorial DVD - it takes you really deep into the product. You'll be astounded at what it can do. I've got K3, and it has some enhancements, but functionally 95% of what is in K3 is already in K2. My main reason for buying the upgrade was to get the expanded instrument library, which has more than doubled in size. But the documentation really suffered in the new version. Bigger instrument library, much smaller doc.