The article suggests “substantial decrease” of depressive symptoms following an 8 week mindful meditation course. We would want to define “substantial” statistically!

http://www.healthcanal.com/mental-health-behavior/depression/61134-can-intensive-mindfulness-training-improve-depression.html

Soul 2 Sole goes beyond and further than mindful meditation, where meditations are aimed specifically at the features and symptoms of your depression.

We find up to                40% relief of depressive symptoms
After a 6 week meditation course, that includes mindfulness and the foundations of healing meditations.

In less than 6 months 60% stop taking depression medication
40% reduce to minimal dose of anti-depressant medication