Louis CK is not for the fainted hearted or easily offended. He has written for Chris Rock so that should give you an idea of his material. His observations and jokes can be cruel and harsh but very funny. Not for the easily offended but ideal for those wanting honest comedy.
Don't let the 2006 release year put you off, I only just discovered this, frankly, amazing man in 2013 and am here to buy a few copies for British friends.
This man knows no boundaries. The stuff he talks about is everyman, observational or anecdotal humour but you find yourself laughing with your hand over your mouth, incredulous, thinking "Why are you talking about this stuff!?".
What's amazing is that throughout, he manages to remain endearing, an affable, American family man.
What is most impressive about this man is just how utterly honest about his life and experiences he is. The sheer inhibition alone is funny in itself. He shows how anal he can be with observation and I could resonate with almost every humorous anecdote he delivered. There was never a point where my attention waned and he consistently made me laugh personally throughout the show - something which only a really good comedian can do.