Before I went back to Muzzy's I used to shoot Wasp Jak Hammers mechanicals in one season I had 4 shots wherethe blades opened in flight. Nothing will screw up your arrow flight more than a mechanical broadhead that the blades open in flight.
I know what you mean. I haven't hunted yet, but out of six Grim Reapers, I had two of them open in flight. That's a real confidence breaker.