Hi There... My Samsung Galaxy Tab s2 9.7 wifi only - just got the Marshmallow download (6-21-16) It's rather large > 1 gigabyte. It takes some time to sort itself out, during the install. It works... from what I can tell... I could still stream TiVo videos when it was all over. It did noticeably warm up, during the download and install. It seems to recharge a bit faster. Still have to wring out all the apps... So far, so good... a benign update - at this point... It's worth every penny I paid for it.