There are customer support managers available as well (and, Dr. Blander tells me, a network of certified trainers and nutritionists is on the way soon), should you need more advice, have questions, or need help understanding your results. Or just want a more human touch.
Does it work? I haven't used InsideTracker, but I have done something very similar with my personal doctor. I had a complete blood analysis done in all the areas covered by InsideTracker's Performance level, and I found I was deficient in a few key areas. In one case, severely. I've been supplementing for months since, have changed my diet, and the results are incredible. I have increased energy, better focus at work, and my workouts are by far more productive.
Just like if you were to fix your car, the first step would be to diagnose the problem. InsideTracker provides that critical look "under the hood" to understand what your body may be lacking and needing to perform at its best. You take car to change the oil in your car regularly... it may be time to take a look at your body's recommended maintenance.