I've put braided lines on about every old bike I've ever owned. The feel is superior and the pressure applied to the master cylinder isn't used to first expand the hose, then apply pads. It (pressure) all goes to the piston for better braking. That said I don't use rear brakes much since 85% of all brake force comes from the front, so front brake lines are far more important than rears for stopping power, i.e. you can skip doing the rear brake line if you want to save some cash.
For those wanting a tutorial on braking forces, just ask.....