I've delt with the ivory interior in mine for almost 4 months now. I have the joy of also having a 4 year old son who always wants to ride in daddy's car. How tolerant of the ivory's quirks you will be is directly related to how OCD you are about keeping the car clean. In short, it's easy to clean but you are going to be doing so VERY frequently.
My thoughts are as follows:
1) It's destinctive and beautiful. So many people have dark interiors that ivory really looks unique regardless of the car make and model.
2) In my opinion hyundai did this 100% correctly. The only surfaces which are ivory are the leather ones. All the carpeted areas are black. Having owned cars where light interiors came with light carpets I can tell you that is a nightmare. The flooring surfaces should always be black.
3) The leather is very easy to clean with the correct products. I personally use and swear by Griot's Garage "interior cleaner" for everyday and their leather specific products for a few times a month. I keep the interior cleaner and some cloths in my trunk.
3) Ivory shows all the dirt and grime that would normally be hidden by dark interior. Every time my son rides in the car I must wipe down several of the surfaces near where he sits in the car after he gets out because I can't stand the look of dirt/dust/footprints on the ivory surfaces.
4) I had to put a towel underneath his car seat or else every time he climbs in and out of it he leaves scary looking footprints on the Ivory leather.
5) Ivory is the only interior with the Matte Finish Black Ash Wood, another item which makes the car more unique. Ivory is also only available with the ultimate package.
I love the ivory and have no regrets, even though I would go crazy if I did not carry cleaning supplies in my trunk. Maybe my OCD will taper off after i've had the car longer. It still has new car smell.
Hope this helps.
--Brian