That is what I'm using when I get to work on a fridge bator. I know a lot of the folks from reptile forums use them. I'm told they are very good. You will have to look around to wire it up or have someone do it for you as it is used to control exact temps in a greenhouse. I want digital!
I use one of those for homebrewing beer. It keeps temps to within 1 degree consistently. It's a bit pricey but worth the money, you will never need another one.
*edit: If you aren't familiar with wiring, I'd get the pre-wired one for $75