Carbon can make great bars but is easily crushable with neglect, so one needs to take a few precautions:
1/ Make sure your stem is crabon compatible. Not all are.
2/ Use a torque wrench for everything that attaches to it: stem face, grips, shifters, levers, accessories
3/ Use a carbon specific blade for cutting, try to go all around the tube first instead of cutting straight through
4/ Use carbon paste at stem/bar junction; avoid grease on carbon