In the era of Inbound marketing, outbound sounds little obsolete.
It is nothing but knocking on the door perhaps.
It may be better than what I can think of - as they underlying principal of referrals works at the core of this system.
They claim that -
"We find the warmest leads in your network so you can work smarter and prospect efficiently"
I have not subscribed to this service - though based on other negative reviews, I am afraid I will ever.
Maybe, will learn more about how they do it and convert the 3-star to 4-star rating.