I only have about 1,000 miles on these tires so far, but I can say without a doubt that, of the three sets I've had on my car, these are the best. I'm coming off of a set of Yokohama Parada Spec-X that had good dry traction but were noisy, bad at cushioning impacts, and hydroplaned like crazy in the slightest bit of wet weather.
I wanted to wait until the winter to post a review, but I've actually experienced every condition so far except for deep snow since I put these tires on. I live in the New York City Metro area and commute heavily, so traffic and weather conditions can be as insane as they come.
On the whole, these tires are a pleasure to drive. Dry traction is excellent, wet traction is responsive and sturdy, and it handles light snow with no problems whatsoever. Road noise is pretty quiet (compared to the other tires I've had on this car, at least), and impacts are cushioned very nicely. Emergency responsiveness is very good as well. Don't have enough miles on them to rate treadwear, though.
Now, as far as the tire's claim of improved fuel consumption - I was more than a little skeptical that a tire could have any sort of impact on gas mileage, and I was right to have my doubts (in fact, I've actually seen my fuel efficiency go DOWN a little, if anything). 90% of my total driving is highways. Before these tires, I was averaging about 325 miles to the tank with predominantly highway driving and about 275 miles with mixed city/highway. Now my highway average is closer to 300 while my mixed average has remained unchanged.
All things considered, these tires are perfect for my needs. They're quiet, responsive, and stick to the road in all conditions. However, if you're buying them for improved fuel economy, you'll be disappointed (but really, that should be the last thing you concern yourself with when purchasing new tires). Would definitely purchase again and highly recommend.