I have my current car tinted - it's definitely lighter in the front than it is in the back. When I'm inside, I don't really notice it as much - I can still see out clearly - I just didn't want people looking inside or staring at me while I was driving
But yeah, be sure to check the legal limits as it will save you money - as for tints, look for something with a good warranty - mine has lifetime warranty and so far I haven't had any complaints.
Do any of you have pics of your Genesises tinted?