My wife's car has Continental Extreme Winter Contact tires on it right now. I'm very satisfied overall, though braking in deep snow is a little worse than expected, due in part to the car's overexcited ABS.
My new Sierra came from the factory with Continental CrossContact LX20. They are very quiet, reasonably smooth, and on road traction has been good for me so far. Many reviews complain of short treadlife on full size vehicles, though owners of crossovers seem happy.
I have not used, or done much reading on the Continental Terrain Contact, though the few scattered comments I've read suggest good traction on wet and dry roads.