Product review (5 stars): Do not use 12 gauge wire!!!
This is a great, high-quality temperature controller. As long as you don't mind a little DIY work, it will serve you well. However, do not use anything heavier than 14 gauge threaded copper wire! I thought I was being smart by using solid copper 12-gauge wire and it was a nightmare getting it all rigged up and into an electrical box. I wish they made a pre-wired version of this, but even then, it's still the best quality temp controller for your money. It has 20-amp relays (if I recall correctly), digital display, easy temp setting controls, and works flawlessly in a homebrew setting. Just be prepared to wire it yourself.