I purchased 4 new tires for my 2005 Cadillac STS some months ago. Their are two different tire sizes that are required i.e different sizes for front and rear. At the time I also purchased the road hazard package which includes rotation, balance, etc. in addition to lifetime alignment. Every 5k miles I brought the vehicle in for an oil change with the instruction to check the alignment; never assuming that I also had to instruct the technician to balance the tires. After approx. 20k miles on the new tires I began to hear significant road noise. I took the car in to the local Tires Plus store and discovered the front tires were beginning to "cup". I asked to have the alignment checked and inquired as to whether they had been balancing the tires previously. I was told no because I hadn't given those instructions. My reply was that I never left instructions to "up-sell" me on other services but the store management hadn't been reluctant to do so. It seems to me that your store would maintain a history and perform a simple tire balance as a routine part of alignments and tire checks. As a result of this exchange I decided to seek replacement tires elsewhere and discovered that the Tires Plus technicians had originally installed the tires I purchased incorrectly. That is, they installed the larger size tires on the front and smaller on the back...opposite to the manufacturer's specifications. I have returned for oil changes and alignment five subsequent times and the mix up with the tires was never noticed. After I brought this to the attention of the store manager, he offered to replace the two tires that were ruined. That promise was made three weeks ago and I still have not received any new tires. Even if I get the new tires, I'll have one new set and one set that will need replacing in a few thousand miles. In addition to the tire fiasco, I've been advised to have replacement parts installed that when I checked with other auto technicians, discovered were not needed. Regardless of how your company handles my tire problem, you have soured a previously good customer. Your store's reputation is suspect in my view and I will not hesitate to inform others of my feelings