Product review (4 stars): Works quite nice.
Bought this for maintaining fermentation temperatures in a mini fridge for homebrew.  Works great +/- 3 or so degrees, after a week or two you'll be able to set it to get the temp you need without even thinking about it.  Keeps my yeast happy.  Only negative for me was the awkwardness of the copper wiring.  Its a little too long and everytime I reposition it it feels flimsy like maybe I'll break it, thats probably just me though.  I've had this for a couple of months now and am very satisfied.  You will be too.  Buy it.