Hi, Brian from Kineo US checking in here.
Here' some interesting data from a recent Adapt release for one of our US clients. This was a global initiative, and the course was released to over 10 countries/languages. The numbers are still relatively low as the course was just introduced, but I think they're still quite indicative. Note IE statistics.Unfortunately I don'f have the version breakdown.
From August, 2013 - October 2013:
Safari (iOS): 91
Opera Mini: 17