if you lease you cable modem from you isp , you be overpay . this puppy pay for itself within 10 month , and with any luck it 'll last 10 year . that be how long I have my old Moto SurfBoard modem . it occur to I to check with my service provider to see if the old modem be slow I down , and sure enough , as a DOCSIS 1.0 modem , it have be blacklist by the company . turn out I could lease a new one from they , or buy my own . so look around the web , read some review , and this sb6121 model get generally good review . I be able to self-provision this new model use Charter 's web-based tool , and within 15 minute I be up and run . hook it up to my wi-fi router , configure the router , and all my device have connectivity . so far so good . the speed difference be amazing . I be finally able to take advantage of all those bandwidth improvement the cable company have be make . even though I be still use a wi-fi n\/g\/b compatible setting on the router , the speed I be get be 2 to 3 time faster than what I have be get with my old modem in place . I have a Apple tv , and since I install the new modem , Netflix streaming be good to go . I no longer get buffer delay , and the video quality be always the highest available . this new modem be smaller , lighter , make more of cheap plastic than my old one , but be in every other way better . at $ 86 on Amazon , it be well worth it . and if you get a defective one , like some of the poster here have , you can return it to Amazon no question ask .