I got a 23andme kit from work and I thought the results were interesting...it said that I'm 5x higher average risk for Colo-rectal cancer, and 17x higher average risk of developing gallstones...which interestingly enough my Grandpa had Colo-rectal cancer, and my mom had gallbladder surgery (and so did 3 of her sisters)...so my results were actually very interesting
23andMe is good, but FamilyTreeDNA is better for purely genealogical results, as they have a bigger database for comparisons and the people you might match are more likely to have researched their backgrounds more thoroughly.
I also found out I have two copies of apoe4 which sucks (11x greater risk of alzhiemers!) but I've up my exercise and coffee as a result of that.