New Magnepan MMGi

Has anyone had a chance to hear them? I could not find much information on what is new from their website. I'm 
Magnepan seldom divulges much information, if and when, they do any upgrades.  The (i) version was known to have a different tensioning of the mylar and maybe a cap or two in the crossover was changed.
no, but the move to x.7 was a big one and I've heard & compared the 1.7 and 3.7i

Maggie will tell you that an i is not considered a full numerical upgrade

a dealer should let you listen, and borrow maybe