The FAA require rapid decompression and electromagnetic interference testing for each individual iPad. Some units fail.
Are you sure about that? I have a done a lot of EMI testing in the last six months and only ever tested one of each device/aircraft. Subsequent devices and aircraft are considered to be OK. Some engineering types might be able to clarify.
And what of other devices? Android? Saw today that Jeppesen have charts available in android format, how long have they had these? Will I soon be able to use a Galaxy Tab in place of (i)products?