We had a server in your DC location in late '08 and couldn't touch 20mbit/sec out, let alone gigabit. Your technicians along with softlayer's were horrible and never tried to resolve the issue-- just asking for traceroutes and blaming IIS. From our prior experience, your "10tb" is just a marketing scheme/fraud.
We tried IIS, Apache, Bittorrent(With several simultaneous linux ISOs), FTP, and iperf. Running everything at once, our maximum throughput out of your network was around 650KB-1400KB/sec. Absolutely terrible performance. The only good thing about your service was the cancellation department replied fast...
If you want to verify my statements, customer id 195742.