One big pro to Tradedoubler is that they track the user through cookies, even if the user has turned cookies off. For example, most affiliate programs track users through cookies. If a user clicks your link and goes to a website, but doesn’t make a purchase, they will be tracked for a period of days (usually 30 days). If within those 30 days they come back and make a purchase, you earn your commission.
One other positive about the Ultimate Bundles affiliate program that your readers may not have realized… They actually offer second-tier commissions too, meaning you’ll earn a share of the sales from any affiliates that you refer to the program. In this case, it’s 10% of their bundle sales during their first year as an affiliate which could be a nice earner!