Designers and content curators, understanding what Custom Fields are will change how you design and how you "think" about data, and this plugin will make your life so much easier. For developers, ACFs will provide a speedy way to prototype and communicate data relationships.
Yes, there is a learning curve, but trust me, take it on... this plugin rocks... and when you are ready, check out the premium and community add-ons. Everyone I have turned this plugin too, has thanked me a million times over.
Well maintained, great support forum, loved.