I use Sigil in a production environment every day with very few problems and with tremendous benefit. Reliability has been excellent. I rarely check the forum because of a problem, only out of interest and to keep updated.
After every couple hundred hours working in Sigil I think about just how well this software works and how much time it saves us. Other than that I don't think about it much, it's intuitive and it just works.
The other piece of open source software we use a lot is Gimp which is also great. Gimp is a large mature project with many developers. Sigil is a small project with just a few developers. It is amazing and phenomenal what you guys have done.
I just wanted to express this. I have become a Sigil evangelist!
