I have a current setup of Airport Extreme in bridge mode, an Airport Express (to extend the wireless) and a Draytek 2830n with the wifi disabled.
I've got a 7800DXL coming tomorrow to replace the Draytek, as I want to be able to tweak the SNR - I have a VERY long line from the exchange.
My question is, will the 3100sn extend the wireless of the 7800DXL in the same way as the Airport Express does? i.e. just one visible SSID?
Reason I like the Apple kit, is that extending the wifi is seamless - only need to connect to one SSID, and coverage is great. However I would love to ditch the Apple kit if possible and go with the Billion combination

I have a suspicion that it will need to be separate SSID's on the 7800DXL and 3100sn - it has been on Draytek kit when I tried it.
Cheers!