When the customer chooses a different size of product which has different price from the variable products drop-down, the price doesn't get updated. Here is the link to check bit.ly/JBYQW0. A size with different colors has different prices but doesn't get updated when chosen one option from this variable product's drop-down. Also the drop-down doesn't show "choose an option" by default and leave the drop down's field blank which may result the customer not to notice the drop-down. And the site loads pretty slow.