@Kevin_Z 

Thank you for the reply but it doesn't give me the answer. 

I already have multiple to-link powerline adapters, so know how they work. I also know the difference between a WiFi access point and a range extender. So the question (reworded) is, in the TL-WPA8630P kit, does the WiFi part act as an access point (i.e. clients connect to that and traffic is routed through the power lines) or a range extender (i.e. clients connect to it and the traffic is relayed wirelessly to the base WiFi device)? 

John

@Kevin_Z 

I think that does help.

Just to be sure though, you are saying that, other than when you originally clone your wireless router's SSID, all the traffic between this device and your wireless router goes through wires (i.e. through the power lines to the 'master' powerline device, then ethernet cable into your wireless router). Is that correct?

Here's a tweaked image from your website; I believe you're saying the green line I've added, dashed for wireless and whole for wired, is what happens, rather than the red line.

Sorry if I seem to be asking the same thing over and over again, I just want to be sure that, if I buy this kit, it's going to be doing what I expect it to as I already have something that does the red dashed line and want something different.

John