They are an excellent product and they support their products, you get what you pay for in this case. I've been through the rounds on these things and their system of rotating "discs" is very smart. They have an excellent concept that increases the evaporative surface area on a set of rotating plastic discs. They work and the evaporative system makes the most sense, especially when you don't have to deal with a wick system. I'm sure Vodka would work quite well in this system. Beer?