I had a clone of the jag one time and I never made any adjustments to it but I didnt like it at all, I lost about 6-7 mph off my top speed due to its timing retarding at higher rpms which is like a rev limiter, I saw zero advantage to that unit and it actually burned out after just a few miles.
I guess the old jag unit may be ok on a stock engine but for an engine with mods that will allow it to turn high rpms it isn't any good at all, it limits potential performance big time.
All that said, I dont know anything about jags newest unit which I believe is an unlimited timing model that works the same as the HD's Lightening set up and its a little cheaper than the Lightening CDI also.
I have one of the Lightening CDI u its on one of my bikes now and it does a good job just like a stock unit does for not limiting rpm potential.
Im sure someone can ring in on adjusting the jag unit but ho estly not many on here run them I dont think.