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This plugin is very powerful and the repeatable field groups are an amazing feature. The functions offer lots of flexibility for extracting information.

I did run into some snags extracting file info, especially for repeating file field types. The arrays did not return some basic file info such as file name. I had to use some of the WordPress built-in functions like basename(get_attached_file(754)) to look up an attribute by post id. I also ran into some difficulty creating extended_return_values arrays for repeating file field types.

I also ran into an issue where null values were returned in key-value pairs called by the plugin's built-in functions. This seemed to occur whenever a field or a field's value were deleted. I had to create a custom script to handle these.

On a positive note, this plugin is a simpler and more affordable alternative to the Advanced Custom Fields plugin, which charges for some of the advanced features that Simple Fields offers for free (like repeatable field groups).

This plugin lives up to its name - it's dead simple to use, but at the same time, it's equally advanced if you want it to be. I thought I was going to need multiple different plugins and lots of custom code to make a CMS-ish theme, but Simple Fields is all I used!