[Asterisk-Users] Call Center and Predictive dialing

[C F]

I know this question has been asked a lot before, but please I would
like to know from personal experience.

I'm looking to use Asterisk in a call center environment, where most
of the calls will be outbound calls. They will have at start 100
agents.
I have looked at vicidial and looks promising, however I would like to
hear from users what they use and how they like it compared to other
products they have tried.

Of interest are:
* Ease of use
* Stability
* Feature set
* Open Source

Thank You