I can not seem to keep a modem work for over 18 month , so I have be rent from Comcast for $ 3 a month . since cost recently increase to $ 5 a month , I take a chance on this product . for only $ 20 , it just have to last 4 month , and then my savings will be $ 5 a month for as long at it work . I use a router and the modem install easily without use the enclosed disk . the Comcast install screen appear right after installation , and it be the easiest setup that I have experience in a long time . shipment be fast , and it come with box with cable and warranty . I recommend it for the price and easy setup .