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I have been very happy with my experience with JB3, then JB4 G4, and now testing the JB4 G5 board. I can not speak for the other tunes but the customer service offered by Terry is top notch.
Also, both the Proceed and JB4 offer canbus integration. This allows you to hijack the gauges, read codes, and all sorts of other useful (and some just for fun) things.
Good luck, either way you go I am sure you will be happy.
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