MSDT makes you more marketable in the industry. If you intend to work in the industry and if you can afford to do it then you should go for it.
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Anyway I taught somebody the EANx course who already had 4 other specs and rescue, they asked if I could certify them as an MSD. I couldn't find any issue with this in the manual so I processed them and never heard of any problem from PADI afterwards.
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