This is highly debatable. Seems like most miners agree that it will be impossible to break even on any mining investment made right now:
https://bitcointalksearch.org/topic/stop-do-not-buy-that-new-asic-and-heres-why-317352
https://bitcointalksearch.org/topic/will-a-sepoct-knc-jupiter-ever-roi-317838
https://bitcointalksearch.org/topic/estimate-of-asic-pre-orders-13-to-15-phs-diff-18b-to-21b-by-end-of-2013-283820