My stock leaves were extremely sagged, so i put in a full length 2" AAL from Rusty's. I probably got close to 2" of lift from it, so my jeep has a slightly racked look to it (which is what i prefer). A year later, there has been minimal sag....however, i don't go offroad.
My biggest complaint is that AAL's are noisy, since they don't have the anti-friction pads on the ends of the leaves like the stock ones do.