We don't have any carpets in our home so tummy time and eventually crawling would be uncomfortable on our floors and I was curious about these mats! Everyone raves about them and to be honest, they're not particularly cheap.  It is super light weight (much lighter than I had anticipated!), but I like the compactness of it and my baby enjoys it too! Worth th  investment as opposed to a rug for the baby room, wipeable and can be folded away if styles change (or baby gets older!).  Would highly recommend this product but I wish it was a bit more economical..