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FWIW here is some background that may help determine your
comfort level:

The basis of this code was written late last year.  Just
before submitting it as a patch early this year I cleaned it
up quite a bit.  Since that time its "core" _mdiff() has
been extremely stable.  I (we) have been using it a fair
amount where I work without problems (early on its use
flushed out some additional requirements).  Obviously I've
been using it quite a bit in this patch to show what I'm
changing.

All of the changes to date have been to 1) improve the API
to make it really easy to use yet still flexible to
customize 2) change the output to meet  XHTML 1.0
Transitional standards and 3) improve output HTML
functionality and 4) correct some corner case bugs.

Jim's notes are correct, 1) this patch is strictly an
addition to difflib.py as it required no changes to the
existing code and 2)
I am currently only involved in this patch and my config-py
sourceforge project so providing support has not and will
not be a problem.