Yes mine has a rather annoying rattle. Took it back to the dealer and they tightened something up and it seem to do the trick, however about 5 weeks later the noise was back. Called the dealer again and they wanted me to leave the car with them for at least 2 days as they said they would need to strip the roof down. Booked it to go in and then we got one of those rare sunny days, so put the roof down and when I put it back up the rattle had gone! Cancelled the appointment, but sure enough after a week or so the rattle was back again :(. Still deciding on what to do, take it back or just keep putting the roof up and down to resolve it for a while.
If i'd found this forum before I got the car, I'd have probably gone for a hard top instead, loved my old Lexus, this one has yet to grow on me.