RabbitsFoot

I bought last month an approved Lexus RX400H. I had a problem with the Mark Levinson CD change. Often error 4 would pop up rendering the CD player out of action until the key had been removed and the car restarted. I took it back to the garage and they have kindly replaced it for me with a non-Mark Levinson unit. I don't feel happy about this. I have mentioned this back at the garage and they have said that both units are the same except for this logo. Is this information right? The sound system was part of the reason i went for the SE-L version. Any help / links / advice appreciated.