Advanced inventory certifications

I like to think of myself as a pretty solid basic inventory manager type person working in a remanufacturing type environment. I have been considering pursuing some specialized inventory training for career advancement and or personal growth. I had a couple programs reccommended to me, most notably:

CPIM

CIRM

Via an organization called APICS

I was just curious if any of the managerial dopers out there are familiar with these programs and just how “marketable” these certifications are. Is this something that the business world is desparately in need of? Is it expected in many high level inventory jobs? Whats the straight dope on CIRM/CPIM certs.