For
Great image quality from the 1-inch sensor (same as Sony RX100 MkIII), it’s a full-on camera you can fit into your pocket, easy Lightning port connectivity, doesn’t drain iPhone battery
Against
Expensive, focus point position sometimes over-ridden, some software bugs/crashes, independent battery (can’t draw from iPhone), iOS only, shutter button position not great with iPhone 6 Plus, fussy to stow Lightning connector
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https://www.pocket-lint.com/cameras/reviews/135777-dxo-one-review-the-iphone-add-on-camera-s-highs-and-lows