I have the apple one and love it. I will say that it's something you need to plan to use. You should leave the house with it already attached and it will slowly top you up to 90% the whole time until it runs out. I have used it when my phone is almost dead to charge my phone but that is definitely not as efficient but still can help in a pinch. I use it a TON and its never fallen off (im using an official apple case). I also use it to charge my phone at night and its nice to have a wireless charger for the few occasions i need to peek at my phone in bed.