cams are running equal timing. I just finished degreeing my JWT cams the other night, and had to advance three of the cams 2 degrees and one cam 3 degrees. I would like to run it for piece of mind more than anything, and if down the road it proves useful for tuning then that's a plus. They aren't cheap sensors though, geeze.
I also noticed that the sensor and harness that come with the Defi unit is the exact same as the Greddy one I have. However, the probe is about 1/2" shorter and I'm unsure if that will change any metering dynamics.