The MA750i came into my radar recently when researching for possible Christmas/birthday present for myself. I've put off purchasing any more headphones since I got the GR07BE (latest favorite) a couple of months ago to save some money and enjoy my other recent purchases (Audeo PFE 132, Sony XBA-4iP, VSD1, UE6000, are the noteworthy ones).
Along with this thread and udauda/Rin's review, I cannot find any other sources for impressions. They look well built and the FR curve looks nice.
Can someone compare the MA750 to the GR07BE sourced through an iPhone 4S or iPad touch 5th gen?
I am also considering the new Sony XBA-H1 BA/Dynamic hybrid that coming out later this month.