The fit is awful. You have to really push the lead in to your iPhone for it even to connect and be recognised, then a message will pop up saying incompatible. If you make even one small knock to the lead it will automatically disconnect and stop charging. I thought this must just be a dodgy lead so I contacted seller and he promptly sent a replacement, however the exact same thing happened with the second one.
Must just be cheaply made Chinese rubbish, as that was £8 down the drain.