One of the best mods I've done!
I lifted my 2015 Rubicon and installed 35" tires. I drove it for a week or so before buying the Flashcal. Once I installed it, I was shocked at the difference in just the recalibrating made! I wondered why I waited the week! I also like the extra features and the display is nice and easy to read. Also the added benefit if upgrading to the Flashpac is cool as well.
Lots of options. Upgraded to flashpaq. Ran into a little problem when my JK BIOS got corrupted but called Superachip customer support and they quickly trouble shooter the problem. Speedo fixed, gear ratios on auto tranny OPTIMIZED, LOW AIR PRESSURE ALARM CLEARED. Itching for gear ratio and Axel tweaks now.