I have revisited this thread in my search for another controller option. I built a really nice STC-1000 and it worked for three ferments before it burnt out on me. I'm certain I just received a bad unit as many people have been using these for a good while without issue, but I can't justify another $30 on something that let me down, fool me once and all that.
Willing to spend a little more to (hopefully) get a lot more, and something that reads in Fahrenheit because screw the rest of the world and their socialist measurement systems
Anyway, I thought I'd add to the thread in case someone else is searching and could use an excuse to spend a little more and possibly avoid having a similar experience.