As you may have heard, Zook brakes fall somewhere in the middle of modern bikes; I'm told not as good as Honda/Yamaha but better than Kawi & KTM. My word for the stock Suzuki system: grabby. Powerful & sufficient, but too switch-like to instill confidence off road.
To resolve this condition, I considered a stainless steel braded line, but Fastline stopped making one for my model ('97 RMX). Galfers (sp?) makes one (~$50), as well as what they say are superior pads, but I ran across a good deal on the Braking oversized rotor. Your DRZs and my RMX are the same model number.
Now I can activate the brake without concern of locking up. Much improved. Not out-of-this-world, but worth the $. The benefit must be from the mechanical-advantage, increased-leverage factor as stated in other posts.
I haven't tried stoppies yet, but would thing they'd be easier to achieve now. (I have an image of one if Thump wants to use it for my icon;)
Street price for the kit (White Bros.) is expensive @ $199. It comes with a new, machined caliper carrier, pads & rotor; the latter is 1/2" larger dia. than stock - a tight fit underneath the stock guard, but do-able.