Ann: Conversion of CDIs into Shares of Common Stock, page-6

You would need to get independent advice about whether or not to convert your CDIs. Apart from the underlying reasons which may or may not be advantageous, if they are held by a company, Trust or individual will have an impact, there are considerations about franking credits (none if o/s), withholding tax, capital gains (both now and later), wash sale, the list goes on.