LetterSeals.com review for CBB Shipping Rates Calculator

I have been using the calculator to show my clients the realtime rates for shipping within the US + globally with postal, UPS and DHL options for a year plus now. It is VERY helpful for the shipping quote to show on the cart page without customers having to move to the checkout process to see the shipping rates. The most frustrating part of online shopping is to not see my shipping options without having to go through a second step and giving a merchant more personal information - this app step in and gives quotes based on the shoppers location without the need for their input.