I have some, they are great for leaded. People will tell you they are fantastic but in my experience they are nowhere near as good as scrim. The blue microfibre versus scrim has been done to death and it seems its just down to personal preference. I thought they were really good to start with and used them for a few weeks but then started using scrim again due to running out of the blues one day. I realised then straight away that scrim is more absorbent and absorbs quicker. I also did all my house windows inside with the blues and they did seem to do a good job, looked great...then the sun shone and showed up thousands of tiny microfibres all over the glass, not good at all. I'm sure many will tell you different but that's my experience. Blue for leaded only and scrim for the rest. You can buy exactly the same cloths at paragon microfibre.com, I think they are the original stockists.