If you use this product (of know of a site that does) make sure you disable cookies asap... Because the info people enter is saved in a cookie .. (nice!) ... as well as the price of the products. .(not clever, but hey) . .. that is used at the checkout.. (yikes!!)
I am not suggesting you should try it, but cookies can be edited using textpad ...
3D3.com claims they have made a new version, a client however says they haven't (they just tell you to disable cookies) ... I do not use it myself, and I am sure they will fix it, but I think it's best as many people as possible know ... Since this can do much harm to you and your business...

Source: All I have atm is a Dutch link to the article:
http://www.webwereld.nl/nieuws/13391.phtml