I know when I had OOL/Bresnan in Butte on a SB6120 with 4 bonded DS channels I could test out at a perfect 30/5 to the on-network speedtest locations (»
www.bresnan.com/speedtest) but anywhere else off-network would be maybe 10-12Mb/s at best. At the time you could see a bottleneck when Bresnan handed off to any of their peers out of Billings on traces. I moved out of Butte 3 months ago so I can't comment on the current state of things there but something tells me things are still the same.