I’ve been a brainbench.com member since 2004, way back when they still mailed you a paper version of your certificates for free when you completed an assessment. (This was cool).
I’ve just recently taken one of their tests again, out of curiosity, and I have to say: They still “have it”. The questions are difficult, to the point yet not insane. They have a real nice balance. I will definitely be using their corporate service again, when I need to recruit.
I’ve found it to be an amazing bull-filter before. Plus, the free personality tests are interesting…