It actually was an easy setup, and it works great!
Our current home setup: We have a main Verizon FIOS router, along with a network cable connection between a Linksys WRT1900AC range extender and the Verizon FIOS router. We did this because it's a large 3 story house and the Linksys WRT1900AC is on a separate floor (2nd floor), vs the Verizon router is on the 1st floor. We tried Wifi a long time ago between 1st floor and 2nd floor, and there's too much interference and not enough of a strong, reliable Wifi only connection.\
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RE7000 setup process: I was totally expecting to have to spend a lot of time like I had to with the WRT1900AC range extender, in regards to setting it up, but this was truly a fast set up process with the RE7000 :). I kept most of the default settings during the RE7000's online software setup process, including using 2.4 ghz range. I set it up the RE7000 as wifi only this time, no cable or device connected to it. Set up time was like, idk, 25 minutes. It can easily be done in less time if you just set up as plug and play, without messing with any of the software settings or fiddling around with anything.\
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I believe the seamless wireless and fast setup process between both Linksys range extenders is due to the fact that it's one Linksys to another Linksys device. They talk well to each other. Of course, I'm comparing this to my initial Verizon router to Linksys setup process; that took a long time, around 4 hours in total with all the stuff I was trying before calling Linksys Tech Support.\
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To Continue with the RE7000: We've had the product for over 2 weeks now and it gets daily use ---> regular Internet usage, downloading large work email attachments, laptop streaming, and use of Apple TV streaming (Netflix, HBO GO, etc.). I should mention too that during the Linksys RE7000 software set up process, it allowed me to configure it so I could keep the same network password as the other Linksys WRT1900AC range extender. Only the network ID's are different between the two Linksys range extenders.\
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It really did extend the range into a wifi dead zone area, which is one area of the 2nd floor family room area, and into the 2nd floor master bedroom. It's a large 3 story house that used to have some spots with little to no wifi connection, the connection dropped out a lot, was unreliable, etc.. Not anymore with this additional range extender!!!\
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Last point I will make: I read an article from the Wall Street journal and they say having multiple range extenders and/or access points for some houses make all the difference, so that's obviously our situation. The more coverage, the better. The example they used was a large Victorian house with many rooms and what seemed like some random dead zone areas.\
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Thanks Linksys, we love this product!!!