It's definitely been fun making two of these and of course using them for all things awesome in the kitchen, but China is catching up and ebay now has a controller for around $13. I ordered one to test it out and it works very well and does the same as the DIY one. It's also smaller and cheaper than making your own.

The advantage of the DIY is still that you can replace the temperature probe if it fails (which mine did) and that the controller itself can be customized a bit more. And of course it's more fun making your own :)

Here's the link to the one I bought: http://www.ebay.com/itm/391373376655 (you can also search ebay or google for "mh2000 temperature controller" to find it).