[mrtron]

Their rates are far lower than whole genome sequencing because it is a "Genotyping chip" or SNP Array.

They don't sequence your genome, they look for about 600,000 common SNPs.

If you do get your whole genome sequenced (as opposed to the outdated exome sequencing), you will get a lot of data but it will be difficult to utilize. 23andme has survey data + lots of customers, and can do this type of statistical genome-wide association studies (GWAS). With your whole genome, you will have much higher resolution data about yourself, but limited ability to leverage the additional data.