Overall quite happy with these tires. They are smooth, comfortable and priced great for Michelin's. They seemed to wear great also, with lots of tread left. They help with mileage as claimed; I went from 9.8L/100km's to 9.3L's/100km's-- approx 1.5 MPG, so that was an added bonus.
On my vehicle they could be 5% quieter would be my only complaint. In the last 2000 miles or so they were becoming a bit louder, but not objectionable.
These tires are not great in the snow as noted-- I got caught in quite a bit before switching to my snows for the season. They are passable in a pinch, but everyone should be on dedicated snow tires if snow is on the ground regularly where you live anyway, right?
I would also not buy these if you want handling and responsive road feel, as that is not these tire's mission. On my luxury SUV, they are a good fit for highway cruising but if you corner hard you will feel the soft sidewall flex and they don't have a very responsive steering feel. They are quite lightweight though so that helps keep them from being ponderous feeling. They drive fairly nimbly actually. They are 2lbs per tire lighter than the LX4's that were on my vehicle, which is quite a bit for unsprung weight. Even though these Energy Saver's are softish they never feel too soft, nor fully in control of my heavy SUV. If I owned a sports car, my opinion would not be as high though.
In the end I would happily buy these again as long as the price doesn't go up much from where it is and I guess that's the best endorsement a tire owner could give.