I purchased a rust eraser primarily for cleaning Shapton Glass stones in between flattering them. It works excellent for this purpose, cleaning the stones perfectly without causing a significant amount of wear to the stones or eraser. I have also used the eraser for its intended purpose, cleaning up an old rusted blade very quickly and throughly. An overall excellent and affordable product.
The eraser is a good low cost option to maintain the higher quality stones.
I have so far used this on my harder edge pro stones, my shapton glass and my ceramic rods. It works as advertised.
I bought this mostly out of curiosity -- and because I use carbon blades on my outdoor knives rather than stainless.
This eraser works extremely well and the quality is high. Now that I know the product lives up to expectation I will always be keeping one in my tool kit.