At this rate the only way CoinTerra is going to be worth is if they produce a 1TH/s machine and price it so good that nobody will even think of KnC. It has to be the same sort of difference like when you see BFLs 500GH/s machine sold for $22k when KnC is offer 400GH/s for $7k - it's a no brainer. Cointerra is going to have to pull off something like this. They openly stated that they want to make it more efficient with smaller chips etc, but with Bitcoin and where the difficulty is headed, that won't matter. Right now being first counts, because at the rate the difficulty is set, by the time the CoinTerra machines arrive, they are just going to be too late and overpriced.

To be honest, ASIC manufacturers should really be talking about 750GH~1TH/s at this point in time.