Range for two story house?
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Don't expect full 200mbps speed on Wifi on this router because for that you need full ac compatible device which supports data rates of 866.7 Mbps on both upstream and downstream.
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You're right. Single channel AC is only 433 Mbps which I think is what that router supports. If you have more than one device connecting to that 5 GHz AC band, you're going to have stuttering while streaming etc. Dual Channel AC, which is 867 Mbps is usually preferred in this case since it can at least accommodate a couple of devices on the AC band at the same time.
But what you should really be going for is a Tri channel AC router that supports full 1300 Mbps so at least you can use 4 to 5 devices simultaneously. Ideally, that router would also support Mu-MIMO so you can increase the number of active devices to around 8 - 10 without any noticeable degradation in performance.
I generally prefer ASUS routers so I'd suggest the following routers (ordered best to good) would be good for 200 Mbps / 400 Mbps during the nights.
ASUS RT-AC88U | 3167 Mbps (1734 Mbps on Quad channel AC) | 8 Gigabit Ports | Supports Mu-MIMO
ASUS RT-AC87U | 2334 Mbps (1734 Mbps on Quad channel AC) | 4 Gigabit Ports | Supports Mu-MIMO
ASUS RT-AC68U | 1900 Mbps (1300 Mbps on Triple channel AC) | 4 Gigabit Ports | Only Su-MIMO
Considering that there isn't a big price difference between the RT-AC68U and RT-AC87U anymore, I'd just go for the RT-AC87U since it provides a decent amount of performance for a great price. It costs a lot less than the ~$200 I paid for my RT-AC68U a couple of years ago.