Choosing ISP for T1 connectivity

We’ve been using Earthlink (on ICG backbone) for 4 years for our connectivity. Recently, we started to experience a lot of downtime due to different problems with ICG network and response time was very slow.
We’re considering to switch to Genutiy, which came up as a first on our list after running comparative analysis of 13 big players in the industry.
Did anybody have any BAD experience with Genuity/BBN backbone?

Thank you.

Alex Avtsin
Network Engineer