Hello, I have 2 MacBook Pro's and 1st gen intel iMac. I will be getting two iMac G4's for my two kids. I would like a time capsule.... But I want the simultaneous dual band as the older macs and iPhones which have wireless g. A fellow on line has one for sale. The model number is MB277AM/A. He is claiming it is the simultaneous dual band, however I'm not so sure. Do you know? Please help as I have less than a day before it won't be offered.