I saw this band open for Between The Buried And Me and Animosity, and I was blown away. One of the best live shows I've ever seen. An easy comparison would be new As Cities Burn meets Explosions In The Sky... it's a wonderful mix of ambience and standard emo guitarwork. I'd definitely recommend it to any music fan.
Giants can easily be compared to Explosions In The Sky, but there's no real reason for it. This is because Giants are seriously 12000 times better than EITS. Seriously. More explosive, more dynamic, more thought out, more intelligent. Anything EITS do, take that and imagine it better - then you've got an idea of what Giants sound like.