Have a TP-LINK TL-WDR4300 downstairs in daily use (have not had the time for a full review) but while not as fully featured as the Asus RT-N66U it does the core job of router well.
With Ethernet was able to push 800 Mbps in either direction over the WAN/LAN interface.
Andrew, do you have any comment on what the correct MTU setting is with this router for an Infinity FTTP connection?
For PPPoE connections the TL-WDR4300 defaults to 1480 and won't accept a value above 1492...
1480 is the MTU setting that the WindowsXP stack uses if it is negotiating the connection directly itself (for example if you plug straight into the ONT), but 1500 is used on an ethernet LAN normally. Does it matter, do you know?
I presume your WAN-LAN routing figure was pure ethernet, was it, rather than PPPoE on the WAN side?