This is a fantastic source of activities and assessment advice (including behavioral assessment). The activities are high-quality, effective, and productive activities that focus on a variety of skills. It is well written, the instructions are clear, and there are multiple variations explained for many of the activities.
I would have given it a higher score but in the Kindle for Mac version, the figures and charts can be hard to read, due to orientation issues. Also, since it isn't a physical copy, photocopying obviously isn't an option, but neither are cut and paste. This makes sharing and utilizing the information a little more difficult. All in all, though, these are relatively minor issues.
I recommend this to anyone teaching a foreign or second language class.