I didn't use a machine at all and as you already know my Doc had me locked out at 0 for the first month after surgery but as I'm learning, there's different protocols for different docs. But even after being locked out at 0 after having my ACL, PCL and MCL replaced with cadaver tendons my ROM was not an issue, I hit 130 after about 4 months. I think it has a lot to do with how good the surgeon is too, because most of the time, it's scar tissue that inhibits your ROM. Be patient and stay positive, it's the only way to get back from a multi ligament injury. Good luck!!!