Hey guys, first post here.
I have the BMW all-weather mats (dealership threw in the bmw mats as part of the deal) but I opted to buy Weathertech front/rear mats and the cargo liner anyway. I found that the Weathertech all-season mats have much deeper channels which should keep the snow/water contained pretty well; this was an important feature for me since I'll be dealing with lots of snow and slush in the coming months. I had the BMW all-weather mats for my 3-series that had a similar triangular design as the current X3 mats - but always had issues when melted snow began to accumulate in the winter (the hem of my pants would always drag along the mat and get soaked). Not an issue if you don't have to deal with a Canadian winter.
The WT cargo liner is pretty nice, fits perfectly, and has cut outs for the tie downs, left-side net, and right-side pocket. I can post some pics of everything... if my new account will let me
