Benn there, done that, got a t-shirt. Two t-shirts actually. The first year was great, the second year with new developers was okay, the third meh, the fourth was a huge drag. We switched to another eastern-european outsourcer and the story reset: first year great, second year new team and meh, then I left but I doubt it went anywhere but downwards. Moral of the story? Longer term contracts are dangerous for you.