I needed new tires immediately 1 year ago because the OE Goodyear Eagles with 45,000 miles were useless in the snow. Since I don't recall them ever being fantastic in the snow I wanted to try something new. Since the highly rated Yokohama Paradas were not available (and they did not know when they would arrive), I got the Kumho KR21's.
These Kumhos seem to be very good in the deep snow and slush. The first think I noticed is that they ride hard, turning the Murano's usually compliant ride into a harder ride, with more shock from bumps and ruts in the road. I haven't noticed anything from noise, so I guess they are pretty quiet. I was told it's the materials used in Kumho tires that make for the firmer ride than for example Goodyear.
I did notice tire spin when starting up on ice or slick roads... so I don't know if that's due to the AWD/traction control capabilities of the Murano or that these tires don't grip well on ice?
At 16,000 miles there does not appear to be any signs of wear yet, so they are holding up well.
My Murano has 118,000 stop and go city miles with noises and leaks and repair bills to match, so I don't know if I will be getting new tires agin for it again. If I do... I might look for softer riding tires. These are very good though.