We had half of the tables covered with them at a local 40K/WFB tournie in the summer, as one of the guys had become the local distributor for them and wanted to show them all off to as many people as possible.
They were extremely nice to play on, and in particular the various ruins from Battlefield in a Box matched nicely with the urban mats.
A tad pricey, though, around Cdn$100 each I think, whereas I get 2m x 2m of coloured felt from the fabric store for $10-$12.