We use this for a behavioral health client. I have not set up the account, but we have taken it over for support. Always are helpful and happy to help, support times are generally quick, but they deliver what is promised and I haven't had any real issues.
Zayo has been newly introduced to us and deployed an a medium size healthcare facility we remotely support in Dallas. Thus far, everything has been good quality and seem reliable. The support reps were helpful with initial transfer and calls to follow up and need for questions answered.
Zayo has been providing us our Data and Voice (VOIP) service for 4 years now. They have been a pleasure to work with. There have been a few times our phones have stopped working and they were great to trouble shoot with to figure out why they went down and to stop it from happening again. They also are able to do most of the upgrading of the firmware for us (central push server).
The Broadworks platform they use for VOIP has some quirks that I could do without (such as the tool bar that is not updated quickly enough to be use-able on Chrome or Firefox), but overall the system works well. I do wish we had voicemail to text capabilities but the emailed voice mails already helps a lot.
We have had our internet/MPLS network hosted by Zayo for the past 6 years (and before that while I was not with this company). Their service has been stellar helping us diagnose issues with our internet connectivity. They have also helped us work with the actual internet providers to get the best deal. Additionally they have been easier to work with when doing "build out" internet connection IE new fiber.
We have had our internet network hosted by Zayo fiber for the past 2 years. We found their sales and service people easy to work with and very accomidating of our lack of technical networking knowledge (routes and vlans on our switches). Their fiber team worked with us to do new construction to all tree of our offices and helped us work out a contract that would be the best for us.