I took it to connect flash drives and a Line6 guitar processor. Everything is working. Flash drives must be formatted in exFat for the iPhone to recognize them in the Files app. Some pros: A guaranteed way to make friends with your iPhone / iPad with flash drives, photo / video equipment, guitar processors and other useful devices with a USB interface. Got cons: Expensive. Most connections will require additional power through the lightning connector adjacent to the USB. Flash drives and external drives including.