While the Dynatrac kit is quality I'm sure, I feel the performance increase for the price is far too much. IMO the pricing comes from ease of install which is understandable but Dynatrac relies heavily on their proprietary brake pads. While bigger rotors and better brake pads are great things my mindset on brake systems comes from my motorcycle racing background. Granted it's a race bike not a Jeep but brakes are insanely important on them so you learn how even the smallest changes such as high temp brake fluid can reduce brake fade, etc. We never upgrade to bigger rotors on bikes, our primary focus is heat resistant materials on pads/rotors such as ceramic and increasing pressure to the rotor. Next would be calipers, master cylinder, stainless steel brake lines, and high temp fluids. Reducing heat/fade while creating more pressure is key to any brake system.
Pretend your index finger and thumb (single piston caliper) are squeezing together an egg now use your index, middle finger, and thumb (dual piston) caliper...which one will create more force to break the egg? It doesn't matter how big the rotor is if you can't squeeze it hard enough. On that same principle you can increase the egg/rotor size to create more leverage with the singe piston but ultimately you would want to do both. Consider all brake pads equal; Dynatrac uses bigger rotors, Teraflex uses bigger rotors/dual pistons, Mopar uses bigger rotors/dual pistons/MC/booster/brake lines. All these kits work but the Mopar kit is by far the most the most complete and its cheaper than the other kits. I would also like to see how Dynatracs system performs if you swap out the proprietary pads.
Don't take this as a bashing on any company but there are differences between them all.