I guess I'm in the minority... Do you all have light coloured carpet?
I have Weathertechs, but I switch back to the carpeted mats in the summer.
My floor carpeting is black, so I just need to vacuum once per week to make it look like new again.
This winter was my first with Weathertechs. They seemed to protect well, but their Achilles heel is that they don't hold much liquid capacity as I have plenty of salt staining near the rear of the front mats where overspill occurred.
This likely happened during heavy acceleration.... SQ5 problems?