Have any of you listened to the rapper 'Dee-1' before?

I just found him on youtube. He is really good but not very well
known. I was wondering if anyone has heard of him.

Here is some of his songs:

http://www.youtube.com/watch?v=r8yF7IQbprk

http://www.youtube.com/watch?v=pXsH7saTPwY

http://www.youtube.com/watch?v=P1IGfv8zSgw

http://www.youtube.com/watch?v=DZBYZk9lDZs