Looking at the developer's website, it worried me that there was not much to go on before I parted with $29! However, the description suggested that this was exactly what I wanted, so I took the plunge and bought it.
There were a few annoying errors in the component, but these have now been sorted out by support, and the latest version is good - it is working well on my website.
If there were more documentation, this extension would have merited 5 stars. However, I recommend this to you if you want to provide live-chat on your website, but don't want to spend money on a hosted solution.
Well worth the money!
A fabulous bit of software, highly recommended.