Long story short, we were paying out the ear for Efax enterprise, but the users loved it, and I loved it because all the fax problems were *their* problem :p Then I was told to cut costs, and we cut efax and rolled into an internal solution we're unhappy with. I'm currently exploring other fax-as-a-service providers and HelloFax came highly regarded in a single user/small business environment.
Is anyone using their enterprise plan? How does it hold up in 100+ user environments?