I've had issues setting up the chat.
When contacting support they kept saying to look into the documentation, instead of reading my messages and answering me.
Their documentation is terrible, and turned out to be wrong too.
The same happened when we contacted them about 18K messages being logged, when we only saw about 100 in our end.
We also had connectivity issues, which we reported.
Support did not help with any of these, and told us to look into our own code.
In summary:
Horrible product, bad documentation, and terrible support.
Won't use again, and won't recommend.
I'll look for other places to give them 1 star if I'm able.