I purchased my 2011 certified Genesis 4.6 a few weeks ago.
There is very little not to like about this car.
Performance is excellent, fuel economy isn't bad (averaged 29+ on my first road trip), warranty is excellent, interior is comfortable, and the car gets complements everywhere I go. Only a few quirks (ex: cruise control isn't extremely consistent and the adaptive cruise control - while a great idea - isn't very useful because as soon as someone pulls in front of you in traffic the car does a huge slow down) The navigation and stereo control takes some getting used to, but now I like it.
The cooled driver's seat is the bomb in this warm weather.
I have no regrets! I love it!
Cooled driver's seat
The "heavy" feel it has
Ride is a bit rough on some of our poorly maintained NC roads (but nothing like I have read in some reviews)
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