I liked the Java Script quickness, but the author didn't seem to know where to stop at employing it. After I found a product to order and pressed the order button, I was presented with a message box alert asking me if I wanted to add it to my cart, making me click twice for the same product. This is really annoying, and defeats the purpose of the Quantity Update box.
The inclusion of the products image in all stages of the Cart is a real pitfall, and could seriously impede a busy server. Shipping options are limited as well. This could be a good Cart with a little work.