I actually don't expect Lexus to do anything, but some GPS maping company makes their database for them and I am sure they want their software to be as accurate as possible. Its not that it doesn't have my streets in the database, they are there just with the wrong names.
I work with software developers all of the time and without feedback, they don't know their product is wrong. I plan on buying DVD updates every couple of years and it they get their corrections in soon enough, it could be fixed by the 2006-2007 CD's. Then at least when someone gets in my car and drives with me they aren't saying "wait, you don't live on Maple St. There isn't even a Maple St. here, etc.".
I love my navigation and have it on two vehicles and it is great even with mistakes here and there. I am totally digital and attempt to never use paper anything!!