What flooring do you use?

Hi all, having just treated myself and the OH to our first Isabella awning, I am again wondering what to use on the floor. Isabella have quite a fancy flooring system available (at Isabella prices no doubt) Does anyone use this floor?  Our usual method is to put a groundsheet down and then use these foam interlocking tiles for warmth and comfort but not the ones with the holes in!! I cant stand this "breathable" groundsheet. It just lets the water  through and you end up with cold, wet soles! We have been caravanning for 25yrs but we dont know all the answers and its just nice, now and again to throw a question to your fellow members. All ideas would be appreciated