500 has better ability to cope with DVD errors.audi4chrome said:Hi guys, few monts ago i had a RNS-E HW 72 SW 460. Now i have a new one, RNS-E A4 version Q and HW 73 SW 550.
This last unit works like the previous, i can't see any difference.
Who knows what are differences between software 460, 500, 550, 600???