This is a hot topic for Nexus 5X and Nexus 6P users. The new USB-C technology has many advantages but adoption of the new standards has proven to be a difficult task. There are many manufacturers pumping out off-spec cables. Google Engineer Benson Leung has done a great job reviewing products and letting folks know if he recommends the cable/accessory.
I have created a post on reddit about this topic and hope this will be beneficial to others:
I will be keeping the Google Sheet updated with the latest information on USB-C cables and accessories!. Stay tuned for more updates.