we use liveperson for almost 6 years and the service is really reliable thats what important. now for conversions i didn`t check it but i`m sure it helps to build the customer confidence.
Yes, Ofcourse i have used live chat software indeed its the most important thing to communicate with the customers.. I would suggest you to use this for best performance which is "free" phponlinechat dot com. And also you get support from them for any queries you face.
like skype , msn, QQ in china, they are liv chat software , so conveniently ,haha and is so importan to ecommerce .