I'd be weary.
For one, scientifically the whole concept of genetic predisposition can be only consistently applied to a small subset of very specific diseases the effects of which you would already be experiencing. Lifestyle choice is a much better indicator of associated risk.
Two, they have historically fucked up badly organizationally, mixing up DNA samples from patients with those of other patients:
http://blogs.nature.com/news/2010/06/consumer_genomics_company_snaf_1.htmlThree, the business model is dying. They have dropped their price by a tenfold in a very short timeframe now. The price they are currently offering is not enough to cover the cost of DNA analysis. This looks like a last ditch effort to save a company on the brink of destruction.