It's usually worth doing when the bike is a few years old. I replaced the fronts on mine a couple of years ago and there was a worth while improvement. It might also be a good idea to check the rest of the braking system at the same time I.e. the pistons are free and not seized in calipers, the calipers sliders are also free and the pads are OK and in spec. I personally would't bother with a braided hose on the rear unless the existing hose is showing signs of failure such as cracking or leaking.