Nothing worse than a Firearm that doesn't behave..
I have a Remington M3200 12ga Over/Under that doubled on me. I killed a clay pigion very dead with two loads of 7.5s at the high house station 1 during a skeet round. The three other guys on my team all wondered why my shot was so loud. Unfortunately there wasn't another shell left for the other bird coming from the low house. A trip back to Remington fixed it, I guess that I wasn't the first to have this happen. Mechanical devices break, but I still trust them over microprocessor based devices. It is easy for a computerized system to have a brain fart.