Been shooting FMJ's for a 3 years with both Longbow and compound. They're a great arrow, especially easy to pull from targets if you do a lot of practicing. I've shot a couple through a deer and kept on using the arrow. I'm trying an N fused Axis right now, and see no difference in flight at the same arrow weight. They are both very usable arrows!
I don't find so much a problem with bending as I do with them getting creased or dented by another arrow. I can't help but think the carbon has been damaged or fractured underneath when I see this. If this happens to my trad arrows, I just keep shooting them, but with the compound, they are put out of service.