I've had CL9 for 5 years now. Really happy with it. Quite a reliable car. The only reason one might want to get rid of it is the high fuel consumption. Used car prices have gone up for all cars due to the increase in prices of new cars.
The transmission is a pet problem, so best to look out for any unusual behavior when buying a CL. I can't think of any other 'pet' problems with it. Parts are abundantly available and prices are quite reasonable, nothing extraordinary in my opinion.