I just installed BMW OEM all-weather mats front and rear after looking at both Weathertech mats and Weathertech liners. I have a Weathertech rear cargo mat ordered for the back.
I prefer the OEM velcro mounting in the front and BMW supplies the same type of velcro disks (and full size mounting template) for the rear mats.
'16 550xi - alpine white over Amaro brown • every freaking option
'11 Z4 - mojave over beige • 6 speed manual • Münich delivery
...and a bunch of old English motorcycles