I really don't think that it's BAD for you, but it might not help your ears at all.
And about the intelligence thing: I would say that Mozart and Serial (two opposite ends of the spectrum, no?) music bot increase your IQ, if not your intelligence.
Mozart, we just know makes you, or at least makes you FEEL, smarter.
Serialism, on the other hand, does it in a much more subtle way and only educates you in the way of music and perhaps math. I mean, if you can actually figure out how they're counting and the rhythms (sp.?) and the system in which it was written, you sometimes reach a higher plane of thinking for a brief period of time (or at least that's how it works for me)