I've seen all of the blurb on the Apple website about the 2.4Ghz and 5Ghz dual band WiFi. I guess my question is how much of a difference does it make? I am looking at upgrading my network, both of my computers are dual band compatible but I have an older Airport Express which allows 2.4Ghz or 5Ghz but not both. One option is to get some of the mains ethernet adaptors but I like the sound of the new Airport Express. I transfer a lot of large files from my laptop to a mac mini server. Will I see a big increase in performance? Thanks.