Good? Think again.
I don't like it because they all have to be Verizon with the exception of one out of the 20 can be another phone.
Can you say flop? Business' can not and will not have the time to find out what service their clients have in order to use Verizon's group talk when they can just get group talk through landline company's, Cisco, skype, etc.
Business often know who they pay for their phone service. So your argument is confusing. The service is for keeping contact with their own employees.
didn't it say that the family contact is the only one that you could have 1 contact outside of verizon and the Group Contact for business can have cell, wireline, and even international numbers as part of it.