Langefels Equipment Co LLC review for Upcharge Fees & Product Addons

I use this product to add steel surcharge fees to products. This application doesn't work well at all. As you need to update fees to the new rates the new fees do not show up. The application even started pulling multiple fees to a single product. The support team is horrible. After multiple emails I never received help or solved the multiple problems. This application should not even be available to purchase in Shopify.