Mate I beleive they are all made by the same manufacture. I have had good results with the generation 3 HMF but then I am running there full system aslo so it all should work well. The way to go is a Power Commander but it not as simple as just down loading a map you must get it dynoed to get the most out of it. To just plug in and go the HMF is excellent value my thing CRACKS.
Regards Overlord