Not sure if its the same one but we purchased a door mat from Asda - think it cost about �15. It is quite big and is supposed to be super absorbent and very good for getting dirt off your shoes etc. Because we live in the country and have 4 dogs, the entrance to our house can get quite mucky so we gave this mat a go. To be honest with you, we have not been over impressed with it so far - especially considering the cost of it!
I have four children, lots of visitors and one of the mats you mentioned. (Think it's called a Magic MAT) I have been amazed at how good it is. Actually, my husband said the other day that he is fed up with me commenting on how fab it is! I was having to wash our hall floor every day before not matter what sort of mat we had, not that he'd notice. Anyway I think it's defo worth it.