There maybe some benefit as Rev A was Draft N WiFi thus it was not officially certified back then, Rev B and C are certified N. So there maybe some incompatibility issues using an older Rev A with some newer generation WiFi HW. Haven't seem much however there has been some issues. The information seen on the box is mostly marketing and we can presume it changed between Rev A and B. The both do the same thing, 300Mb on single mode N if you have the supporting WiFi HW that can do 300Mb connection rates between the router and the client HW. Not all can. I have a 2007 Mac Book Pro. Does N just fine however caps at 130Mb on my Rev A, B and C model routers on 2.4Ghz. I can install a 2ndary adapter or a bridge which can support 300Mb. Just all depends on the Client HW.