imagine you are on a hill, up against an obstacle and the clutch is in, brake is pressed. now you need start rolling again, without losing traction. without a hand throttle you have to jump on the gas when you pull off the brake. the jeep rolls back a bit, and as you engage the clutch the wheels spin. you can't get over the obstacle. now imagine you are holding your jeep in place with the brakes, and can slowly engage the clutch as you work the gas with your hand throttle. you can ease the jeep up and over the obstacle without the harsh jolt causing wheelspin. bottom line: it makes a HUGE difference in the rocks. also helps when in the mud or water, because a sudden jolt by unseen dips won't cause you to accidently jab the gas pedal, and it also allows you to increase the alternator output when winching or airing up. best $ i ever spent on my jeep.
'05 LJ, ~4" lift, 35X12.5 Toyos, 16" beadlocks, HPD44, HPD60, 4-speed Atlas, 4.6L stroker