The product demonstrates the ability to set default quantities for product option values (as an addition to the basic functionality of the module - to display quantity inputs for option values) and compatibility with another extension -  Live Price. At the moment of the loading of the page all option quantities are filled by their default values (assigned on per product basis) and the  Live Price  module calculates the total price appropriately to the quantities. 

The Live Price  module also provides the price updating on every change of option quantities. 

The Live Price  module (as well as its improved versions  Live Price PRO) is not included into the package of the Quantity per Option module. It should be purchased and installed additionally (if the dynamic price updating is needed).