So the Individual Field Disruptor from Disciples of Harmony is a bit potent, and highly annoying when used against someone with a lightsaber. Or really, just any powered weapon. From the description: "If the field enters engaged range with any other electronic device, the device shorts out and becomes inactive for the remainder of the encounter."
Is it just me or is that a bit over the top for a gadget like that? Of course, this should preclude the character using the IFD from using anything with a power cell, but for someone who doesn't use such weapons it's pretty insane. And it can be abused by a character by giving someone else his weapon, enter engaged range with the baddie, then turn off the device and catch the lightsaber/vibrosword/random weapon tossed by the near-by friend and go to town.