i can see why people would run gigas, but then think abut how many people are running terrakion to counter the meta, then gigas is pretty much dead against it. I mean i would try it out, but i would take into consideration how many people will be running terrakion, i know that if you run into terrakion you don't have to use gigas, but for me i just don't see it as like one of the first things i would test. But try it out you never know. =)
i can see what your saying with fighting being less consistent, but yes the threat of lost remover and other sp energy removers is great, plus you can recover the fighting if need be, and you can't with sp energy.