You should also be aware that 23andMe, as of late 2013, is using their new v4 chip. Instead of 967,000 SNPs included on the old v3 chip, the new v4 only has 602,000 SNPs.
There is still loads of data to look through, obviously, but some things are missing. For example, I was hoping to get a closer look at my BTD gene (biotinidase), but found out afterward that it's not included on the new chip. There are a few other genes that I've tried to look at that aren't included as well.
A little disappointing, but overall, still worth the money.