 I've had nothing but problems from day one with the Kia K900. Shortly sfter driving the car off the lot, I felt a vibration coming from the front of the car, immediately brought it back to Kia... They claimed that the tires were "out of round" because the car sat on the lot for so long. So they balanced the tires and told me to put miles on the tires and it would go away. I brought it back again... They replaced the tires, it still didn't fix the vibration. They replaced the wheels, then told me that the car was fine... I took it off the lot, and to my dismay, the fix didn't work... Then hey replaced the drive shaft... It still didn't work, the vibration was still there. Kia corporate got involved... They sent out a specialist, with a newly designed drive shaft.. Promised me that installing this newly designed drive shaft would work because they have had numerous customers that have had the same problem with their K900 models, and it fixed the problem 80% of the time....I had to wait for over 25 days for the drive shaft to be installed.... And it still vibrated... The magical drive shaft still didn't work.Kia finally admitted that this was a problem inherent to the car's design and engineering and that it will never cease to vibrate as it does. Furthermore, they informed me that The vibration is within the normal operating specs of the vehicle, and there was nothing more they could do to address it.All of the above transpired within two months of driving it off the lot. I just want to give them their car back, get my money back, so I can move on from this nightmare...they've refused to take it back. They've refused to give me my money back. It's been two months since they acknowledged that they can't fix the vibration... I now have to sue Kia to get them to take their defective designed car back and return my money.Don't waste your money or your time like I did. There's a reason why they're leasing a 60+k luxury car for 399/month..... Seems like a great bargain...right? Don't buy a Kia. I did, and never will again.