On the negative side: it provides no guidance for the beginner (using the status bar would have been straight-forward and of help to the beginner, but isn't used); there is no explanation that I could find for the different colours used to represent the elements; the documentation discusses `model' when it means `DTD' (I could not find anything about individual element models the correct use of the term `model'); I found representation of bracketed parts of an element model confusing, particularly if that sub-model was a parameter entity (in the demonstration DTDs one parameter entity expands to `double- bracketed' elements in one element model and single-bracketed in another); layout can either be vertical or horizontal, but in neither format is the aspect ratio of the screen properly utilised. In short, I found it easier to read the printed demonstration DTDs than to view them graphically using Near & Far. I imagine Near & Far may come into its own with very large un-structured DTDs, but I was not able to assess this.
As a single package for the design and maintenance of a DTD library, Near & Far seems not to be value for money. As part of a large CADE system, it may be.