I have a 2006 IS350 that I bought prior to the model introduction. The dealer is 40 miles away. When I had TSB's done I just dropped it of, any time of day, and they gave me a loaner, either an ES or a RX for free. I then picked up my car at my leisure, a day or two later, whenever I had time to go there. I got a CEL over the weekend and took the car to the dealer today. They took care of it and I was in and out in an hour, having had premium coffee and muffins and watched the big screen TV in the cozy waiting area.
You might want the dealer to pull up the service records to show that all the TSB's have been done. There were several fixes done to the IS 350's, nothing serious, but they should have been done.