Heavy brake dust and squeaking is common for this type of brakes. You will need to seat the brakes properly and it may need to be done again after a few thousand miles to stop the squeaking. These a performance brakes that don't like to be babied. Reliability is great. Maintenance costs are at a premium if you bring it to a Lexus dealer, otherwise you can save a few buck bringing it to your local shop for mainentance, but you risk the old adage "you get what you pay for."