I also bought one of these from amigakit - you can get it installed with the regular workbench disks that came with the a1200. Its not that wonderful!
However - in terms of file transfer - you are probably better off using a CF and a USB memory card reader to get things on and off the a1200.
I didnt find the performance to be very good at all. In addition it doesnt support
the more modern wireless encryption protocols. So to use it with any great regularity you will need to alter the settings on your wifi router to use a much less secure protocol.
If you want to get data off your amiga's hard drive you can always connect it
to your PC and using linux the DD command will help you to transfer the image onto your pc. Linux also suports reading and writing amiga file systems directly too.
That can probably be done on Windows also but i would have no idea how that works (I dont use windows much) . Im sure someone else could help here.
Hope this helps in some way
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