I have tried the powermax 3, the power button, blue chip, edge comp and drag comp. The biggest problem with the first three is that the engine cut out severely. I'm assuming because there is no timing changes as there is with the edge box. I talked with several different people on what the problem was and most of the people I talked to told me that they've never herd of this problem. But I could go to tdr discussion forums and find several topics on this same subject. I know people are using timing boxes and fueling boxes together, but it cost a lot more than just buying the edge box. The other problem is that the boost module on every one of these boxes except edge went bad and I'm sure you know, but when that happens, the computer sees no boost so therefore no fuel. I'm a dealer for all these boxes except the power button, but I personally think edge has the best box.