XML Documentation

I am trying to decide on a documentation utility for VB projects and am reviewing the following options;

1. Sandcastle, http://sandcastle.codeplex.com/

2. VBDocMan,http://www.helixoft.com/vsdocman/examples.html

3. Document X, http://www.innovasys.com/products/dx2008/overview.aspx

I have found that sandcastle does not support a jump in and use approach, lacks documentation and support.

I am reviewing VBDocMan and Document X.  Any thoughts drop a comment.  I will update once i have completed my review and made a decision.