Any knowledge about micronutrient testing/Spectracell labs?

Any knowledge about Micronutrient testing by Spectracell labs? I went to a naturopath recently who recommended this, but did not push it. Supposedly it can tell what vitamins and minerals your cells are deficient in and does so in a way other blood tests dont. The cost is $190 (they have some agreement that if you put them through your insurance they will accept whatever fraction of their cost insurance pays for and the patient pays $190, unless the insurance covers the whole price..I don't think mine will pay anything). I googled and it gets some writes up of being useless and some being very helpful.