The advantages are probably (Score 1)

1. Size. These bactirium can supposedly create a biotransistor 5 microns square. 2. Power handling. The article states that the organic membranes may be able to handle >1MegaVolt. 3. Rugedness. They can't kill the things with ultraviolet, or other means. And with the ability to handle >1 MegaVolt potentials, it could reduce or elimnate static discharge damage. AS far as what they eat, I would guess from the article, that the bactirium are usually, if not always, in a state of perpetual hibernation, requiring no substanance. In fact, feeding them could be bad, as it would induce them into division. This could cause breakage, short circuits, or who knows what. I wouldn't want to come home to a computer foaming at the floppy.