I had a not very old Tucson and the clutch/box was making some rattly sounds, along with heavy clutch pedal. I'd read about dual-mass flywheels in these things and found you can convert it (quite cheaply) to an ordinary flywheel. Once it was in bits it was discovered mine already had a normal flywheel, it was still an expensive clutch though!
But if you like the car it might be worth investigating.