Product review (5 stars): No problems whatsoever maintaining a steady temp with this controller.
I put this purchase off for far too long. I finally got around to building a custom fermenting container and this was the key component. In hindsight I realize I could have built one for less, but with some monitoring and minor adjustments to start, this keeps a very consistent temperature. I would recommend this to anyone looking for an inexpensive and easy to operate temp controller.