W3 Custom Product Options

This has proven the best program on shopify if you are a retailer with products that need many different kinds of options, some required, some optional, some text boxes needed for measurements, etc. The interface also makes it easy to attach more than 1 product to the set of options instead of having to edit each individual product. From a customer stand-point, the design and interface is easy to choose and see the added prices for different options, etc. Finally, their customer service has been a huge help! I had entered code incorrectly and they went in and made the fix for me for no charge. I highly recommend W3 as your options editor.