Yes that's right. You can test the product on their site.
It is truly amazing and free. You can develop around the sources legally.
Best of all, it works great compared to other paid products.
Sorry...
The best integrated Paid chat weve used is Comet Chat,
Its not free. But highly integrated - all the way into member level with superb support
Simple javascript install plus You can schedule a guided 1-on-1 session with one of their engineers to kick-start integration
Works flawlessly
My 2 Cents..
The best option is atomchat.com
The even have integration for socialengine.