Hi Matt
I bought some a few months ago, the same time as I bought a set of genuine greenglides, they are better than nothing, but not as good as greenglides, makes the wand much easier to push and does stop the wand skipping as it does on some carpets, I put mine on a 2"tube 11" prochem wand but could only fit one on the rear as the opening would be virtually closed with both of them on.
Hope this helps
John