I use Scentsy wax and Scentsy warmers only. If you use wax that isn't Scentsy wax in your Scentsy warmers if it damages the warmer it voids the warranty. I like that Scentsy backs their products and that my warmers have life time warranties on them
I use this type of product, but it's not the Scentsy brand. It was a gift from my boyfriend's mother and I haven't had to but new wax cubes yet. I'm not sure which brand I will purchase when the time comes.