Altho i ahve not used it yet quite much i have to say that i was more than pleased when i fully charged my phone in less than an hour without any problems. the phone was a sony experia 1 mark 2 totally drained of battery. I have to mention tho that it was a perfectly sunny day and all the panels where wide open.
Manufacturer should include a Lightning cord for iPhones/iPads. You may buy this and stash it in your emergency go box, only to find you don't have the cord you need.