Read the biography, make up your own mind. The same site also provides several other publications of interest on the subject. The biography was written by Edward, Canon Sell, a Fellow of the Unviversity of Madras. His works are the result of dedicated, lengthy research by a historian of impeccable repute. You will be delighted I am sure, to find numerous ancient arabic sources in the footnotes.
I will begin reading it tonight, it sounds like quite an informative piece. I'm still kind of a newbie when it comes to trying to figure out the mystery that is Islam. I'll have to make note of the ancient Arabic sources, Thanks again!