I got this genuine VW one which is great. http://www.ebay.co.uk/itm/221500646373?ssPageName=STRK:MEWAX:ITIt%27sIt's not rubber but a flexible material which is a breeze to lift out and shake/clean, and the material cleans up easily. I did just that last week as had a spillage from a shopping bag - see pics. The only downside is it can be a bit slippery so things occasionally slide around when driving enthusiastically, but I have a cargo net I can use to stop that. Before After Original floor nice and clean underneath.
Also just got this one from eBay, very happy with it