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Meta-Analysis of 209 studies published 2013 in Clinical Psychology Review: "Conclusion: MBT is an effective treatment for a variety of psychological problems, and is especially effective for reducing anxiety, depression, and stress." [1]

[2] is a recent meta-analysis published in the same journal and looking into identifying the underlying mechanisms of mindfulness-based therapy aka how it works: "These findings are largely consistent with the theoretical underpinnings of MBSR and MBCT. Evidence for mindfulness, cognitive reactivity and emotional reactivity as mechanisms support the key theoretical premises underlying MBSR and MBCT that the cultivation of mindfulness skills leads to insight and non-reactive acceptance of one's experience which in turn lead to positive outcomes."

The underlying theory of this course is sound and has been shown to be on a similiar level of effectiveness as other therapies including pharmacological ones. Whether this specific online course (or any online course) is effective i can't comment on.

[1] http://www.verksampsykologi.com/wp-content/uploads/2013/11/K...

[2] http://www.researchgate.net/profile/Kate_Cavanagh/publicatio...