I just checked it out because the idea seems awesome.
Things I noticed:
While Hibiki is a goofball, the moment she gets properly motivated she kicks into overdrive. The scene with her rescuing the little girl goes on for four minutes as they race through the city streets, dive into the canals and climb up the side of skyscraper to get away from the Noise.
They do a great job here of showing how the Noise are an aberration to the rest of reality, but not nearly to the level of the witches in Madoka.
Hibiki's gear is Gungnir, the spear of Odin, which will always pierce cleanly through its target.
Tsubasa's battle scene is silent, with the names of her special attacks written on scrolls. That's a great artistic choice, but I don't think they're going to keep to it.
Activating the Symphogear for the first time is painful for the user, which makes sense if it's some kind of mutant power.
First Episode Impressions: 4.5 out of 5 stars. I'll definitely keep watching.