Vzoom requires 2 extensions to support the Virtuemart product platform. The product installs ok and works. I had a problem with the VZOOM not working on additional images, it stopped the images appearing. The problem was resolved by supplier within 24 hours with a new version of the zoom.php file. Can only say how excellant they are.
My only critism is that they have no language files so the Move mouse over image text is across all languages. I patched the zoom.php to replace text with a magnify graphic.