Variety of attribute types: text field, text area, dropdown, checkboxes and radio buttons, multiple select and date fields, static text, yesno, file upload, customer group selection.
Ability to include attributes in customer-related emails (e.g.registration confirmation, password recovery). Now in your magento - dependent attributes functionality.
Multiple options for attribute display: registration page, billing info page, customer account, manage customers grid, order grid, order view pages. You can enable and disable display of fields for each of the above locations.
Ability to upload images for checkbox and radio button field types.
Optional verification of unique values for attributes
ability to display customer attributes on the list of customers, which is displayed while creation of order from admin panel.
Rut validation (specific field validation for chilean market).