It was the most profitable at the time.
After mining 2, I switched back to ETH. (http://www.autoadmit.com/thread.php?thread_id=3765896&forum_id=7#35089851)
It's probably legit. I bought some (but damn you btc) (http://www.autoadmit.com/thread.php?thread_id=3765896&forum_id=7#35089862)