Basically bought this car from the inside out. Compared to 330i, Audi A4 and felt the TL was a better value and much more spacious. After a year there have been no defects to speak of, so quite satisfied with build quality. Performance is quite good although torque steer is evident under hard acceleration. Ergonomics are excellent and runs fantastic on the highway. Manual mode transmission is a little disappointing as it does not force the transmission into quicker gear shifts.
I have owned my TL-S for a year and a half and have 13K miles on it. Overall a great car. I get 19-20 in the city and 30-32 on the highway at 72 MPH. Good suspension and great surround sound. Minor issues: fold down rear seat would be good, the trunk is so well finished there is no point to tie it down. Rain rolls off the roof onto the driver's seat when you open the door. No good CD case holder in the car. Passenger seat height adjustment would be nice. As you can see my issues are minor. I got 86 more HP than my 01 Accord for the price of 91 octane and with no real mileage penalty. Had considered a G35 but did not want RWD in the snow and the MPG was much higher for the Acura.
I purchased my TL-S in July 2008 after seeing the spy pictures of the 2009 models. So far I have 7,500 miles on the car and it has been flawless. The 3.5L makes this car a sleeper, it's plenty fast for me. I shopped the G35, Lexus IS350 and BMW 3 Series before buying the Acura. The nice part about the car is the value for the money, this car comes loaded. With Lexus, BMW and Infiniti the options are expensive and add up quickly. An IS350 with the same equipment as this car stickered at over $45k, same with BMW. I was able to purchase my TL-S for $33k, that was $5,800 off the sticker. Was able to get a good deal with the ugly 2009's ready to hit the market.