Nice looking ride 👌
I would say the biggest common complaint is pulsating brakes on the GT. It's a known issue that Kia didn't address until the latest model year. You can save yourself the headache by replacing pads, or pads AND rotors, if you want smooth, maximum brake performance.
I've also seen complaints about weather stripping discoloration, paint peel in random areas and hatch rattle, which is an easy fix.
Other than that, these cars are proving to be mostly reliable.
Enjoy! 👍