Share what I know:
- This router is a massive overkill.
- No device will be able to fully utilize it's bandwidth.
- No reason for AC68U/AC87U users to upgrade as (wireless ad) will replace (wireless ac) sooner than we think.
You don't understand the AC3200 then. Let me wrap it up for you:
From a plain link speed perspective, this router is NOT faster than the AC68 and AC87. Also, this router is not meant to be an upgrade for the AC87.
Asus release this router as an alternative to the AC87. It uses a completely different technology than the AC87. Instead of going with a new chipset that support MU-MIMI and higher linkspeeds like the AC87, the simply deploy more radios on the AC3200 and use a technology called Xstream to intelligently and automatically distribute Wifi clients to it's three different radios.
The goal is to separate slower standard clients like 802.11g or 11n from the faster 802.11ac clients. That is very desireable because if you mix clients with different Wifi standards on the same radio, the slower clients will dramatically reduce performance for the faster 11ac clients.
What this router will do is put 802.11g and 11n clients on one radio, and 802.11ac clients on another radio, completely separating them from each other and allowing 802.11ac clients to operate at full speed. Something that neither the AC68 nor the AC87 can do.
So this router is anything BUT overkill. In fact, it's a much better choice at this point in time than the AC87, which uses technologies that no Wifi client can support yet (there are no MU-MIMO clients out there and there are no 4x4 clients out there that would support the higher link speed). The Xstream technology on the AC3200 on the other hand is completely independant on client support, it works out of the box with any client that's out there.
The AC3200 is comparable to the Netgear R8000.