I will admit that I love going up and having my refillable mug honored for the price printed on it. I kind of halfway collected mugs over the years, and have around 60 total. Around 30 total for 2012 (year they started single year refill) to present, and around 30 from 2011 and before. Every single mug I have from 2011 and before says on it "Refill offer subject to change or cancellation without notice" or "Refill offer subject to change or cancellation at any time without notice". They did market at one time a mug that was supposedly forever, but I believe they were all made of glass. I think because we were able to refill these older mugs at the price printed on them over the years we just started thinking they were forever.