Just picked up an Asus AC66U router to go with my new rMBP. I'm sharing files between it and my iMac and am disappointed with the wifi performance. I have the iMac running to the router via cat6 and the rMBP connects to the router via wifi. I confirmed the wifi connection is established at a PHY of 1000 Mbps. Copying a 3GB file from the iMac to the rMBP shows at 45 MB/s from an AFP share on the iMac to the ssd of the rMBP. However, copying that same file back to the iMac AFP share takes 4 times longer at fits and stops of about 8 MB/s. I tried replacing the router and many different versions of firmware. The rMBP is apple refurbished but only two days old with no software installed. I tried resetting the pram and reinstalled osx to no avail. Any suggestions? If you have this router, please post your setup and performance so I have something to compare against. Thanks!