I prefer mechanicals over fixed heads (rage 2 blade), mainly because I value accuracy over indestructibleness. It's harder to be accurate with fixed blades if you end up having to shoot over 50 yrds. If I knew i was always going to shoot 40 yards or less then i would go fixed blade, but thats not reality. As much tuning as I do, mechanicals still fly better. In my opinion an inch or two difference at 50 yards makes a difference, especially when you add in all the other variables than can cause you to be off.
I've never had a mechanical not open up. I have had blades bend because I hit a rib. Not ideal, but if accurate and you hit him in the right place that's just fine. A well placed half a 2 inch blade is better than a slightly off fixed in my opinion.
Anything is possible but the guy who said he's double lunged a doe and shot two coyotes and didn't have a blood trial must not have been using Rage or he had bad shot placement. I've shot both and it's always a bloody mess. Entrance and exit wounds look like they animal was hit with an axe.