I own a 2006 lx470, and a 2002 ls430. I own old cars. If I have a problem, and I want maximum convenience, I can drop the car off at the dealership pretty much whenever I want and they set me up with a nice loaner for the entire duration of the repair. I can do this whenever I want, without any scheduling headaches. But I have to pay the dealership premium for this experience.

If I want to be more cost effective, I call my local repair shop and they usually have me sorted within the week.