It is very stable. 

This is a very stable solution. 

Earlier on, but not in the last two years.

When we first started using it eight years ago, we had some issues with the sound quality, and that's what I was thinking about when I was thinking stability. But the sound is much better, and in the last three or four years, the sound quality has really improved, and we never really had problems with it crashing or kicking us off.

GoToWebinar is stable but sometimes there is a problem with high-speed internet. Any trouble with the internet for either the instructor or the attendee will be a big problem and this is an issue that we constantly face. The internet is key.

Using the telephone-only option for audio eliminates issues for us.

I have had no problems with respect to stability.