Anker is a well known brand and has a good reputation with their batteries and chargers.
My MacBook Air charges without a problem. (The original Apple charger broke within a month after I bought the MBA.)
This product is stable and smaller than the original Apple Charger. Highly recommend to anyone for those who has MBA and/or mobile phones with Quick Charge capability. One thing you need to be aware, This is a 30W charger, so not good for MacBook Pro (Need 60W).