I'm in the third unit of the book, but I already noticed mistakes in the answers to some exercises. In some other exercises , you are asked to answer in finnish, but the keys are in english.
There is still no audio available to go with the book (the only cds available are those of another edition) which makes some exercises impossible to do.
It's a shame because the book is otherwise nice. I love the insights on Finnish culture, the grammar is quite progressive, and the links inside the e-book make it easy to check your answers exercise after exercise.