I bought the weathertech FloorLiner and CargoLinerfor out ML350 and Love them!!! They are like a bowl that will hold the water. The floorLiners fit perfect. The cargoLiner is off just a little bit but still fits very well.Have any of you replaced your floor mats with a set of Weathertech liners? I'm likely going to buy a pair soon, was wondering how you like them.
I also have the MB rubber floor mats, heres a listing for them 1998 to 2004 Mercedes SLK230 Rubber Floor Mats Real Factory Items Black | eBayThis isn't what the you asked, but just to make sure you're aware of the option, there are OEM rubber all-weather mats available from Mercedes. You can get them at the dealer, or online from dealers...I picked up my set online a few months ago for $37.50 plus $11 shipping. They have raised rubber SLK lettering on them and seem to do the job nicely. I'm not familiar with the mats you mentioned so I can't compare them, sorry.
The part number is Q6680350.