Dlink DI-614+ rev a vs b

[mids1999]

Does anyone have any feedback on the differences between the dlink di-614+ rev a vs rev b?

I noticed that the rev a has 2 antennas and an ARM7 proc
the rev b has one antenna and a ARM9 proc.

How do they compare to each other

[mids1999]

anyone with any comments?
I know someone has to know what the difference in performance is unless there is none.

Please someone respond.