It is very time consuming as it doesnt give you a full list.
You run the sitemap generator and want to fix broken links.
It finds one on /a.htm and 123.htm is broken, it reports it as a broken link.
So you go to /a.htm and fix the broken link to 123.htm to what it should be.
Rerun, and now /b.htm is pointing to 123.htm as broken, so go fix b.htm.
It would be nice if we could have it give a full report of broken links and referers. Would just speed the repair process by miles.