I have the Subaru mats and they work pretty well to keep slush and water confined to the mat. There is no higher lip around the outside, but all of the grooves are the same depth and there are no "drains" off of the mat.
I do wish that the mats were the exact same shape as the carpet mats that came with the car. The rubber mats are slightly different in shape, but not enough to make a huge difference. I leave mine in year-round.