Same. Have the "extreme business class" tier and it's still slow as hell (supposed to be running at six to eight megabytes, but I'm lucky if it ever gets to one) and far too restrictive (140GB goes fast in a large house-hold). It's a rip-off.
Are you sure it isn't 6 to 8 Mb/s with a small b? 8 Megabits = 1 MegaByte, so 1 MB/s is exactly what speed you should be getting if that's the case.
Maybe? That would explain the speed, at least. Swear I was told that it was megabytes, though.