orange or chrome ecu box?

I`ve read what dgc333 was saying about the MP boxes, that the only difference in the 3 is the rpm that they will cover accurately. I think the orange box was good to 6k, chrome good to 8k, and gold to 12k. I have had trouble with the orange box in the past though and I don`t know if there has been anything done to rectify the problems that MP had with them.