Talk:Nano Generator/@comment-84.180.216.110-20120224094721/@comment-4111213-20120224152555

They are an excellent purchase and extremely helpful in the late game. Using a Large Economy Scrolls you can purchase them for 75 € each. It is possibly the only building that players really regret not purchasing as many as possible when it was available, so even if you buy all 5 I don't think you'll regret the purchase later.