TurnOne has it right. 70% braking power comes from the front due to the shift in weight balance. Any DMV roadbook will tell you that. Larger , dual calipers up front because of this. Most panic skid crashes are from riders applying the same type of pressure ( or more ) on the rear brake during an emergency situation , that they usually apply during normal riding conditions. I think this is from muscle memory. But, during a hard braking emergency stop , there is alot less weight on the rear wheel. So , the slightest amount of pressure on the pedal , can cause the rear to " lock up " and skid , in turn causing the rider to lose control and crash. If I was'nt so cheap , I'd of added ABS to my order. It'll help alot of riders keep the rubber side down. Whether or not you use your rear brake during normal street riding , I believe all riders should find a safe place to pratice stopping quickly using only the front brakes. This repeated practice will help you build up your " muscle memory " , and may save your ass from losing control when some 90 year old blue-hair decides to pull out in front of you at the last possible second.
Ride safe , and enjoy your new bikes guys !