Agreed. In a perfect world all production bugs can be reproduced on a test instance, but that's often not the case in the real world. Also, I've seen plenty of

Agreed. In a perfect world all production bugs can be reproduced on a test instance, but that's often not the case in the real world. Also, I've seen plenty of timing sensitive bugs that get covered up by the delay introduced by the attached debugger. The much feared "Heisenbug".