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It seems that the disk has the TMC data, as the same disk is obviously is being used in the newer (idrive/MOST) cars. Hard to tell if the service has been paid for or not but if the disks are good for the newer cars, chances are it might have been paid for...
BM53 has only one tuner, so adding a dedicated TMC tuner with an antenna splitter may help...
Based on some other posts and no first hand knowledge, I may say that BM54 has two tuners but no support for Sirius radio, and BM53 has support for Sirius radio but only one tuner.
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