ICOMOS Int'l Museum Pass

Is anyone familiar with this pass? Looks almost too good to be true. Free admission to tons of amazing places around the world (museums/sites).

It's cheaper to join in the UK, but am now an American living in France. 
ICOMOS is a genuine longstanding organization.  I would buy the pass directly from the ICOMOS site, to be sure that you're not getting an impostor site.   
Interesting to note that another private company, The Cultivist, is now advertising similar worldwide museum passes.  
@Splatty 

It's everything you've heard, with one caveat.

You need to be a museum professional. I happen to have been in my life, so I am eligible. Most people would not be.