I have the highest speed comcast connection available in my area and have be pay a monthly modem fee for several year now . I have be think about purchase my own modem for some time but just hadnt get around to it . with the lease modem I be get around 9-15 mbp on speakeasy or other speedtest site . with the Motorola sb6121 I be now average 30 + Mbps and have even see it peak up to 80mbp at time ! this modem will pay for itself in a year and be a amazing improvment over the lease comcast modem . setup be a breeze and I have have no issue with it . I just wish I would have upgrade a few year ago .