Actually, with a 10% difficulty increment, you'd break even after 160 days according to BitcoinWisdom.
Say what? Try again, this time dont forget to enter maintenance fees.
The highest difficulty increment it will support is 4%, and then it takes nearly a year to break even. Morover, it requires an end difficulty that is just 90B, The only way difficulty will be that low a year from now, is if Bitfury 28nm falls flat on its face, KnC joins BFL and HF in bankruptcy, spondoolies is bombed by Hamas and friedcat put in prison.