I switched to the JB1 because it supposedly has the smoothest power delivery out of all piggybacks, but it doesn't. I suppose this is a symptom of all piggybacks d/t the necessary intercept and modification of whatever signal it's intercepting.
I could be wrong, but I'm just going off on how the car felt through hard canyon runs, freeway entrances, and aggressive passing on the highway.
With a JB4, I can understand the better responsiveness of how it works due to the added monitoring of the O2 sensor and direct plugging into OBD port.
With that being said, I believe the Dinan module is worth every penny you pay for it especially under 200, whereas the JB1 on map 1, untouched, has left me feeling a little disappointed.
Furthermore, this is all based on how I felt on the drive with the kind of driving I do. Of course, it'll be subjective for me and anyone else, but this has been my experience with the two.