For enterprise level and other uptime reliant customers it can be very important to have true A+B redundant power. We provide this at our 350 E Cermak location and it is a big selling point for the location.
In addition to colocation service plans, we also offer high availability dedicated servers out of 350 Cermak which take advantage of our 2N infrastructure. High availability dedicated servers add: redundant power supplies, 2N redundant power, and fully redundant public and private network ensuring there is no single point of failure outside of the server.
Overall, its the way to go if you can afford it!