Doesn't redirect the visitors outside of your site like other real time chatting system. Also the price is pretty good so no complaint there. Lastly, pro-rated refund when we decided to temporarily try out the competitions. Now we're back to Olark, so....

Embedding live chat with a line of JS is pretty sweet. Helps us communicate with our users by pulling specific ones (triggered by analytics events) into a chat and lets us provide live help within our app! The web interface is good but logs us out too easily. The api is okay and the administration of operators is good. The price is okay, currently still on a free startup plan but will need to pay soon.

The ability to speak with my clients in real time