I take a chance and buy a refurbish unit that look almost new -lrb- I notice a few light scratch -rrb- . installation with Comcast do not go smoothly with the automatic procedure but after a phone call to Comcast , it be up and run in a few minute . I have have it run less than a week and in that time the whole system have only crash once -lrb- typical for I -rrb- . I run a speed test with the old modem right before I install the new modem . the old one clock in at 35 mp download and the fastest I have get with the new be 24 mb . slower , but not noticable in my app and I can still stream high-def Netflix well . I read somewhere that it may not download as fast as older model but that it should maintain it be speed better throughout the day . in any case , it seem to work as fast as the original Arris modem that be cost I $ 7 a month . so far I be happy with it ! PS my home phone be now on the internet with magic Jack and that work very well and I need my modem to stay on 24-7 so I be hope this modem work a long time without crash . I have the one crash and be here to fix it quickly -lrb- simple unplug , wait a few seconds , then plug it back in -rrb- . hopefully those will be rare .