If it aint broke don't fix it. Wheel bearings can be a pain because you have to undo the upper and lower control arms, outer tie rod, caliper, rotor, and disengage the axle from the knuckle. It gets even more fun if you have to drive the bearing out of the hub yourself. Most garages will want about 250 a side.
With a propane torch, large snap ring pliers, and the right sized drivers you can do it with a sledge and careful pounding. Drive the spindle out of the hub first with a smaller driver. Heat and impact or torque driver the screws that hold the dust shield onto the hub. Heat and remove the large c-clip. (heat, PB blaster, then tap with flat screwdriver and hammer to rotate and free it) Finally, drive the bearing out with a large driver. Of course the bearing drives out the same direction the spindle did. (outward and away from the car as if still installed) Impact sockets and whatever else I can find do the trick for me. Oh yea, you have to cut the outer race off the spindle with a rotary cut-off tool.