Their support I would imagine would stay the same but alot depends on where you are located and where your clients are located. I have an FDC server with their Chicago datacenter and I've never had an issue (knock on wood) with the company.
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Yeah I think their support and reliability network wise is good at either location. I currently have 2 colo servers in their Chicago datacenter and 1 at the Denver location. As others have said though there are pro's and con's about both locations for example the Denver datacenter having the UPS and generator backup and the Chicago one not having that but a larger network connectivity. I've been impressed with both locations though as far as support and network so I think either one you choose will be a good choice.