Im quite sure they can be read, Cant see them being scrambled because a tuner i know scanned a car that was tuned by some other very popular respected tuner and he could read the map no
problem and commented there was room for improvement.

(not with this tool though)
Also another tuner who im not going to name is tweaking my map to reduce a bit of smoke and maybe add a few more bhp and he has asked me if i can get hold of one those flashers and read my already mapped ecu by someone else and send him the data so he can tweak it, so it must be readable.
If this is the case , the kit on ebay would be very useful in the following way, say you have a standard PD130 and your mate has a remapped PD130. You hook the tool up to his car and read his ecu and then you rewrite your own map to the same parameters by copying it and then you upload it

thats of course if its true that it reads and rewrites ecu this should be very possible?