I've nearly finished unit 12 of the 14 units. Out of the other resources I've used thus far this is the best.
At first it may seem that the course is leaving out important details (such as personal pronouns in the beginning) but this is just part of the course's careful structure, which is one of its best qualities.
The end-of-unit tests are comprehensive, the exercises are sensible but not exhaustive and the whole course is well-paced.
You'll find almost nothing on writing Japanese (except for some very light work with the kanas) but for speaking and listening it's an excellent resource.
As others have said, you can make progress with this course very quickly - before you're even halfway in.