I've been using Ardour to edit a podcast for about 5 years now and it's been great. After setting some custom keybindings I ended up with a fairly optimized workflow, especially with the ability to edit at 1.5x playback speed, which not many other DAWs can do apparently.

It's not without its few glitches and occasional crashes, but it doesn't happen often enough to become big problem for me. I've been happily donating monthly to the project.