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I'm on a gigabit package with my ISP. Wired I pull 945megabytes/s down through the TP-Link and the Asus. Wireless with the TP-Link I can pull 800megabytes/s down, with the Asus the highest I would get is 650ish megabytes/s down in the same location. Also from further areas the TP-Link pulls 400megabytes/s down, the Asus would be around 230megabytes/s down. I ended up returning the Asus C3100 since the TP-Link C3150 offered much better performance. Both Routers were in the same location, and used the same wireless channels/settings during my testing.
I used speediest.net for all the tests and ran the test multiple times over the course of a week with each router. Also both routers were in Access Point Mode as I use pfsense as my firewall.