When the PBAoE +Absorb proc in the Vigilant Assault IO set activates, it plays the same FX as one of the Force Field buffs (at your character's feet, because it uses a pseudopet). When the PBAoE Heal in the Defender's Bastion IO set activates, it plays the typical healing FX you see in powers like the Empathy set's heal. Both of these procs have very high activation rates, so the FX for the activations are going off constantly, and it gets to be very annoying. Other chance for Heal and chance for +Absorb procs don't have any sort of FX, the floating numbers being enough to let you know they've gone off, so do the Defender ATOs really need to be different? I would much prefer it if they weren't so spammy.