I've had my car approximately one year now and drive it regularly. It has about $26K miles, but just recently ( two months) I've noticed some performance issues. Regardless if it was in the morning and the engine was a little cold or in the middle of day, the acceleration would slip. It was difficult to replicate the issue, but it was consistent enough to notice. On several occasions, I would redline or come very close to redline. It was as if the car was in neutral, but then immediately adjust. I took the car back to Lexus twice, but they were unable to identify the problem. Finally, just last week it happened again and Lexus finally decided to replace the transmission. They said they were unable to identify the problem, but would replace it anyway. In lieu of my problems, I was given $1000 in service credits.
Overall, I really like my car, but now I'm somewhat skeptical that I might have more issues down the road. I am leasing, so I guess that helps in some degree. Thought I'd share this information.