Realize that the seller is from London, United Kingdom, England.
Ask the seller questions such as if it is one that can be used in the U.S. Some software just like anything else is not compatible from one country to another.
Ask if it is a U.S. licensed product in the box from the company itself or if it is a copy.
Ask them why they can offer it for such a low price when it retails in the U.S. for $189.
Ask them if they are an authorized retailer for EQ.
Ask them for references since they are new on eBay.