I was expecting yet another Myers-Briggs, but I found the actual test (36 questions, each with 4 aspects and least/most options) interesting. I don't know how effective it'll be at gauging employees, but I think it does a good job of minimizing opportunities for 'gaming' the test. Almost all the options are fairly neutral.
I took the test, but sadly, I'm not willing to pay that $50 to see the results!