It's not as good as Avidemux, in terms of options. In fact, it doesn't even have options.
(But I can't imagine it being less stable. That's Avidemux's weakness.)
The site's copyright date is 2009-2011, which may mean that it hasn't been updated in 3 years. For most softawre, I'd say "no big deal". But open-source H.264 encoding has been refined several times since in the past few years.
I've attached it to this post. I hate it when software disappears from the Internet. (And yes, it happens frequently.)
It's still very, very weak compared to MainConcept, or the MainConcept SDK encoding in Adobe Premiere.
At least the guide would be easy to write! "Open file, name new file, press go button. Done!"