Often find that cattex and rifco balloons can have slightly higher ratio of defects to that of Qualatex, belbal and sempertex. But still worth purchasing... Just buy larger quantities to avoid disappointment.
From the balloon-ace website: "Can I return burst balloons?: Any customers who feel that a balloon has been, or is, defective, should contact Balloon Ace, within 48 hours of the defect being noticed, and we will determine how to proceed. Please do not send any burst balloons back to Balloon Ace, without proper authorization first. This does not affect your legal and statutory rights."