These have been fantastic for most of my pimples, even on some that hadn't fully come to a 'head'. The go WAY more quickly and are less painful. I find them helpful to leave on over night. You can buy them pretty cheaply on ebay.
Its not worth 13 dollars.. I bought it and so far it hasn't taken pus from my whiteheads. Its not bad, but i have to have more clear and big whiteheads for it to work well. Dont be impatient like I was and only buy it if your acne is pus filled!