Bought this car new. After 140K I still love it. One repair (about a month ago) other than normal maintenance. Fast (enough), quiet, comfortable, reasonable mileage for this type of car. Build quality is excellant. Styling still looks good. If they still made them I'd buy another in a skinny minute. I do NOT like the newest generation TL even though the mechanicals are pretty much the same. If you're looking for a great used car, the CL-S should be on your list. You'll have to get another one though, I'm keeping mine!
All of them.
I've only found two issues. The brakes are typical Honda, I replaced the front rotors with Brembos to solve. The CD player fails after a while. Did some research - the player is an Alpine unit, only the speakers are Bose. So be prepared to upgrade both if these are problems for you.