I use one currently on my female ball pythons enclosure. It creates a hot spot of 90 and is controlled by a reptile thermastat. Using a heat controlling device is a MUST with any heating pad, especially human.
But anyways, I love it so far. Steady temps, easy to wash cover for it, and it seems safe. I do replace once per year just to give myself peice of mind that its always in good working condition and they are only 20-30 bucks.