Absolutely not. Let's just say I spent a significant amount of BTC to order the batch 1 Lightnings, which were a colossal failure in regards to hashrate and energy consumption. Later I also upgraded to Thunder X3s through the customer appreciation deal, which were slightly better but still missed the mark.
Anyone ordering the upgrade blades will be similarly screwed, the power requirements still f'n suck and by the time they ship, the difficulty will be sky high due to KnC, Alpha, and all the other ASIC companies shipping competing scrypt systems. Nobody is making or will make any money with Zeus hardware.
[I am an owner of a black widow and a thunderx3. I can tell you that ROI is not going to happen at all. Having to wait until the end of the year to receive the upgrade in my opinion would be another failure in ROI. The downward spiral in Bitcoin's value has me thinking most currencies are doomed shortly. ]