Careful with advice..........
I gather all the folk giving advice about the wisdom of IREX and ATPL have studied the CASR drafts of Part 61, 91 and 133???
Even today there are limitations of what a CPL Holder can "Command"......under Air Transport in the new CASR's this "may" become more limiting.
I say "May" because Part 133 is still in draft form.
Mr Selfish......the IREX Examination may seem irrelevant if you are not an IFR pilot.....however it provides the basis for you to expand upon, as you develop your new skill.