Be aware of buzzing...
I have two "Lithonia Lighting" shop lights that I bought a couple years ago from HD for $20 each. I just added two of the "Utilitech Model # 0313520" lights from Lowes ($13 each) and noticed that they both make an annoying buzzing noise that the others don't. Both brands are electronic ballast models that take 32W T8s. And I ruled out the different bulbs as the culprit by swapping them between the different lights. I thought that buzzing was only a problem with magnetic ballasts, but have since read that inexpensive electronic ballasts can be noisy as well. It's not what I would call "loud", but it's annoying me nonetheless.