RT, when I purchased the D-link, I called TWC prior and they said it would work. But you know cable customer service! When I received the router and couldn't get it to connect with the TWC modem, I called D-link and they told me the problem was it wasn't compatible with TWC. I had to return it, with a 15% restocking fee, and have used TP-Link ever since!
The nice thing about Costco is they have a generous return policy - 90 days even if you've used it (electronics). I'm still concerned about the distance and the 1 directional antenna...the outlets I'll be using will put the devices at the back (wrong side) of this extender, which may make it unusable. It also has some bad reviews on Costco. I guess I can try it out and, if it doesn't work, go for the $80. ($65 TP-Link is an Amazon Lightening Deal) Only thing is, I have to order the D-Link and the sale is over next Sunday. Not sure if that gives me time to even receive the cheaper unit to know if I should have purchased the Amped!