my linksys cm100 modem die after less than 12 hour of use . it work fine when the cable technician setup we service . but the next morning , there be no light on the modem . probably a thermal issue with the power supply cause premature death . I could not return the defective unit to Amazon because the package be open and more than 30 day have elapse since the purchase -lrb- we have to wait a long time to get the house wiring ready for cable -rrb- . so , I contact Cisco\/Linksys customer service . they determine that the modem be defective and issue a rma . they make I pay to return they defective modem to they . and the replacement they send out be REMANUFACTURED -lrb- scratch - no user manual -rrb- . think about this from a customer 's perspective : Linksys manufacture a defective product . Linksys make the customer pay the shipping cost to return the defective product . Linksys send out a use , refurbish replacement . Poor business practice if you ask I .