A:AnswerYes. Expands to about 3.5 inches. So it will fit the iPhone 6 and 6s with case.
for the 6Plus, will fit a thin case but not a full on Defender.
A:AnswerNot very well. If you have a pop socket, you'll need at least an inch clearance on the bottom of your phone (for vertical stance), and and inch in the middle (to hold it horizontally).
If your volume buttons are in the way of the 1 inch clearance, it'll probably mess up your photos also.
A:AnswerIt fits mine... Love this item, works great! A little difficult at first to put it on but you get used to it. Needs to be a tight fit to hold the phone.