I tried it on myself and my S/O and it both pegged us with at least 75% accuracy. I tried it again and entered my birthday as a day late and it changed the profile and didn't sound much like at me at all.
It got me OK. The only problems were that it said I was a procrastinator, and that I was hypersensitve (I don't think I'm the former, and I'm sure I'm not the latter).
Pretty cool overall though.