One of the most enjoyable features of Motion is its ability to play back even moderately complex projects in real time - allowing for a type of interactive development process where you can add and animate layers while the project plays back. In fact, the real-time playback feels so intuitive and natural after only a short time that it becomes quite addictive - to the point where it can be really annoying when the performance begins to slow down.

Apple has recently revised the entire Final Cut Studio section of their website, adding a large amount of descriptions, images, and video training on Motion. You can see some short videos on key Motion features here.