I used Assimil German with Ease (the newer "German with Ease" edition, but the method is the same as the classic "Without Toil") for about 3 months, completing one lesson per day as recommended. Here’s my honest take.
Get the version with audio (CD or download). Without audio, you lose half the value. assimil german without toil
4/5
Great for intuition and passive learning, but don't expect fluency without extra work I used Assimil German with Ease (the newer