We switched to Tierzero because of their fresh young attitude towards hosted PBX, high speed internet access, and competitive pricing. Tierzero handles massive amounts of data at an enterprise level, but with a customer support team that you become familiar with, know by name, and remembers your name! Their competitive pricing and flexibility is paramount.
Whenever I have to deal with Tierzero, I never feel like I am dealing with a scripted customer service or sales rep. Unlike a lot of communication companies, they can actually communicate.
In the rare occasion there is a service interruption, they are on top of it. We are notified via phone or email immediately. If I unplug my router to perform internal maintenance, I receive a call almost immediately to ensure that I am aware the router is down. Simply they are on top of customer service, the way you have always wanted.