Summary: I bought this device to act as a wifi repeater. I live in a 3BR apartment in a 90-year old house... just brick, sheetrock, stone and wood here... and I don't have the best wifi coverage. One of the modes of this device is to be a repeater. The included instructions are not the best, and the full manual online is marginally better, but I was easily able to configure the device as such.
Summary: I read another review stating it extended the Airport Extreme network, it kinda does, but in a weird way. I had set it to repeater mode but the router issued me a 192.168.x.x ip while using the same network ssid (the airport devices extend and keep the 10.0.1.x ip range/ I tried to change the DHCP settings on the TP LINK to reflect that but it said that it was not a valid IP Range).
Excerpt: I have this set up as a bridge to my wireless-G network. It works great for in-network stuff (streaming video, network transfers, etc), but it seems to choke on internet based transfers (downloads, Youtube, basically any video related streaming). I'm not sure if it's because I'm using it as a bridge, but I don't think it matters.
Pros: Easy To Set Up, Fast Connection Speed, Secure Connection, Small