I love this program! One of the hardest things about learning a language through software is having the consistency to actually sit down and do it. Usually boredom sets in and interest fades. Not so with this software, it has an almost video-game-addiction quality to it. The workouts build upon each other and suck you in and I constantly find myself doing "just one more" section.
My favorite feature is that in some of the workouts you can record your own voice and play it back. Being able to hear and compare your voice with the instructor's seems crucial for a language that is so tone sensitive.
The flash animations allow for clear deconstruction of the grammar, and the vocabulary consist of a very useful selection that you can put to practice immediately.
Over all its a fantastic learning experience.