I think the best part is this product is resuable. Spend about $20 on this product, and as long as you wash it and take care of it, it will last you quite a while. It is uniquely shaped also so you can get into crevices a square sponge might not get into.
Also, if you put too much product on one spot, you can just roll the BB over that area and it'll take off just the right amount!
I love it!