I love mine! We've had mophies for every iPhone so of course we had to get them for the 6+.
Mophie battery lasts all day and then when it's depleted, the 6+ battery finally takes over late at night. Perfect for going to screenings or events straight from work and for fun all-day/all-night things like when we're in Vegas or when we're home in LA and stay overnight at Disney whenever we have some extra time.
Really love that the opening is on the top again. Much more secure, especially with a lanyard.
Yes, it's a bit heavier and slightly bigger than when using the Apple leather case but it isn't cumbersome at all. Completely manageable and actually easy to hold - certainly easier than when not in a case at all. And yes, I do use a neck lanyard with this case as well. I also use a Nobiggi Finger Strap attached to the mophie to help steady the phone, especially when taking photos. And I am a bonafide two-handed user so I have no delusions about using the phone one-handed except for taking photos!
Nobiggi Finger Strap on Amazon link (stock photo below):
http://www.amazon.com/gp/product/B00...mUvbUpU2479140
Nobiggi 3-pk on Amazon link (stock photo below):
http://www.amazon.com/gp/product/B00...mUvbUpU2479140
(Uses a great 3M adhesive that stays well but isn't permanent and doesn't leave a residue on *most surfaces. YMMV.)