Casa do Codigo
The app works great and the new version has an easy interface. With some creativity you can do tons of customizations in your store with the metafields. In our case we add some custom fields for books information and adapted our templates to display these informations in a proper manner.
We use metafields extensively in our theme. This app makes it easy and convenient to manage that data. For example, we use metafield data to communicate lead times for out-of-stock products. Other uses might be country of origin, or special handling instructions, or a quote from a happy customer. If you need to go beyond the basics, this app is highly recommended. Been using it since 1.0 very happily.
Awesome App! You cannot develop or run a store without this. 5 stars from me :)