Very Useful and can just be carried about anywhere along with your portable power bank. But do keep in mind that if you have a bulky portable power bank then you might find it difficult to hold and use your phone with it. I have an Mi 10,000 MAh power bank and it is pretty slim enough to be used with an iPhone while charging with this cable. The charging power is pretty powerful. But the durability seems to be good enough but not strong enough to be roughly used. Totally recommend this product.