Enjoyed reading but have to say that 1) this is a ridiculously crowded market and 2) there are some very good options that start at free (Olark, Zopim). But, best of luck and nice job on breaking the revenue seal.

Edit: Many apologies, I misunderstood the service. $97/month for actually handling the inquiries (up to 500/month) then sounds like a bargain.

Edit: I went back and studied the website more closely and while it does describe the service you mention, it doesn't seem as clear as it could be. The spotlight seems to be on the web chat window which is a very well-understood mechanism and it's hard to get past that to understand that you are actually wo/man-ning the chat sessions. I would really work on making that cleare because at $100/month, it's a no-brainer for a lot of business types.