Bought these to replace my OE Pirelli P6 All Seasons. The new set of Kumho Ecsta 4X (+1 size) is terrific - a clear step up from the Pirelli's in nearly every regard. They're a bit of a harder ride (might be due to the +1), but the dry traction is spectacular and the steering response is exceptional. Excellent on-centre feel and great communication through the wheel.
The Ecsta 4X is quiet on smooth pavement but on poor roads, not so much.
We had a bit of a late snowstorm last April, a couple weeks after I had the tires mounted (I use dedicated winter tires here in Alberta). The Ecsta 4X's highly asymmetric tread seems to contribute to poor cornering on snow/ice, although straight line traction (including braking) is acceptable for an all-season tire. I definitely would not recommend this tire for use year-round in Canada or the regions with serious winter conditions.
Probably the best thing about the Ecsta 4X is the price. Far cheaper than my car's OE tire, despite being clearly better. Ordered online from Canada, the shipping and other non-product fees constituted about 1/3 of the total price but still far cheaper than buying locally. Great deal, Tire Rack!