I just googled cointerra and lo and behold this company came up as the first paid link:
Forget about Cointerra - Buy 20nm 5 TH/s Bitcoin Miners Now
Adwww.ctsminer.com/
Worlds Most Powerful Bitcoin Miners
CTS Miner has 970 followers on Google+
Searching for ctsminer led me here. After reading through this thread, I would not buy anything from them.
Wow! Same ad if you type in knc miner or butterflylabs!
That's ridiculously smart! Makes sense... when you register the keywords, you can enter anything you want. wow. hehe