I had recently contacted SC Johnson about the longevity of their plugin oil warmers. I simply was courteous of their life span. Because I had been using the same ones for nearly 2 years, I figured that they maybe in need of replacement. Mind you, I was only seeking information. Not only did they refund me the cost to replace them, their also sending coupons for their products. That is absolutely unheard of. Never expected and always appreciated! I'm certainly going to shop a bit wiser and look specifically for their products. I know not of any other companies that backup what they sell. Thank You S C Johnson. More companies out there need to implement your standards.