Bests & Worsts Reviews from Amazon

I use this product primarily for paninis. I noticed, after a few months of very light use, that the non-stick coating is fading off of the metal plates . I contacted the manufacturer and was told that the non-stick coating is fading off because I use butter or oil on the bread per their instructions on page 27 of the user manual. The manufacturer is replacing plates but requires that I return the defective ones at my expense. Paying to ship defective parts back to the manufacturer because the product was used per their instructions is problematic.