CYP450 Genetic Test - Anyone Have Experience with it, good or bad? (x-post r/depression)

Link to what I'm referring to: http://www.mayoclinic.org/tests-procedures/cyp450-test/basics/why-its-done/prc-20013543

Therapist recommended this, as did my mother, who said she had a friend do it and found a medication that helped her after years of failing with different SSRI's. I'm a bit skeptical, as is my psychiatrist, but I'm wondering if anyone here has had any experiences with it? Thanks in advance.