This anime isnt that much popular, but i loved it, the reason why is the world created for the anime, the mechas itself ain't big deal, but everything else look great, specially the grimoirs, but what i like the most was the inspiration on [url=http://en.wikipedia.org/wiki/HP_Lovecraft]HP Lovecraft[/url] work, i would love to get my hand on his books after watching demonbane and getting to know a little about the Cthulhu Mythos... I would recommend watching the anime after this, SHS subbed it and each ep is rich in notes and references, they actually investigated every concept, everything they could about the Cthulhu Mythos, plus the notes alwayscome with great music to accompany them...
Overall i think the anime was quite good, but not everyone might like it...