Your satisfaction is guaranteed, or we refund your money.

我们保证用户满意， 否则我们就退款。

Usually they'll put in a little gimmick, they'll add 10%, they'll give you 110 dollars back to saw your satisfaction is guaranteed.

通常他们会加入一点小花招， 他们会增加 10%， 他们会返还给您 110 美元， 确保您满意。