What do you think about air pumps

[GpsFrontier]

I am new to actually doing Hydroponics but have been interested in it for years.
I just put together two different systems, one uses pvc, two liter bottles and a reservoir like Ron's 11 plant system. The other one is a 32 plant system with baskets that suspend over a holding tank and both systems are ebb-and-flow design. But my question is, I haven't seen anyone talking about Air pumps for oxygenating the nutrient solution in the reservoir. Any thoughts, is it worth the electricity?