ah kewl, guess i'll try the target one since i'm cheap🙂 i do use chamois, but they are a pain to use. reasonably fast if u want a spotty dry, but not if u don't. from what i read the blade has less friction on the car surfaces, can't be bad.
btw was the costco one the "real" waterblade? the target one was some other brand
anyhow, anything that speeds up car washing is a good thing🙂