The 7900 is a dual band 2 and 440 radio, the 8900 is the quad band radio you are thinking of.
I looked at these Ebay radios also and there isn't enough info to tell if the are B stock radios, which would be service center refurbished radios, or where the they initially came from.
The only complaint I have with my 7900 is the speaker is not very good, which is typical of most ham products, so I use a small midland land mobile speaker that is considerably better and makes the radio a pleasure to use.
I used to use mine a lot to listen to the US military FM satellites in the 250 to 270 MHz band which at the time was populated by Brazilian pirates using them to talk from the Amazon to other areas of Brazil.