It's a fun one! If you enjoy brainteasers, you'll like it! And, apparently, anybody who scores at least 19 out of 33 is a "genius." I dunno about all that, my own high score notwithstanding.
I scored 20 out of 33 in the first ten minutes. Then I spent about another 2 hours or so on the test while at work. As of now, after having spent approximately 3 hours, I've managed to score 30 out of 33! I had my co-worker (who told me about the site) tell me one answer that I knew I'd never get, so my score right now is actually 31 out of 33.