I really like the website; it's well done and look professional. I'd be confident enough to pay for the service.
The bad news:
I really don't see a reason to use this service. There's already a thousand calendar event reminder thing that will remind me when I need to call back someone. And, even if they all sucked and I wanted to use yours, I'd hate to be able to press "1" to call.. I'd prefer to call it on my own when I want during the day.
So, you say you spent 8 weeks on the project. It's very well done and seems like you thought about lots of details. BUT, imho, too much time have been spent on useless details (Like using all those jquery plugins on the signup form) instead of talking with clients that'd pay for this service. But then, I hope I'm wrong and if so, I apologize.