I just purchased "Sings Reign" along with "Telegraphs in Negative" today, and I have not stopped listening to them.
'Post-rock' as they call it... faux-classical as I sometimes like to cal it. It is definitely in the vein of bands such as Godspeed You! Black Emperor, Mogwai, Lull, Noise Gate, Silver Mt. Zion, etc... Yes, there are members from GYBE in this band, and though the sounds are probably in the same genre, I would not necissarily classify them as similar. Perhaps to the untrained ear it would be considered the same, but Fire to Flames seems to veer much more towards the experimental drone/atmospheric/static/randomness in nature. If you're not sure what I mean, or think that this describes GYBE already, you will see what I mean if you purchase this record.
I highly recommend both of Fire to Flames' recordings. I feel it inspiring, haunting, calming, cerebral, and any other "makes me sound smart" adjective you can throw in there. Like I said, I have been listening to these records almost non-stop since getting them this morning, and it puts me in an interesting place. I actually reccomend this over most other post-rock I've been exposed to.