If anyone's tempted to visit, the home page is in French. Click on "Chiffrer un produit" and you're into the configurator which has English translation (top right). All the magic is on the third screen, after selecting a category and a product. The disposition of options and choices, plus prices for all choices, plus the 3d rendering, plus all the totals, all recalculate in the browser with zero latency, based on previous choices.