I'm pretty sure it's the same, Nonna. I think they were called e-cloths when they first came out.
I wouldn't be without the Karcher but sometimes I get a bit of a smear along the bottom of the window. It disappears if you rub it off straight away with an e-cloth.
Our shower room window is too small to bother with the Karcher so I just use two e-cloths, one wet - with a spray of Viakal on it, and the other one dry to wipe it all off. I think the trick is to work quickly because the drier the window, the more you are likely to get smears.