I really like the Vivarium Electronics thermostats

http://www.reptilebasics.com/thermostats

they are priced about the same as the herpstats, but they dont have a quad zone option (Oh how I want one!!)

A good thermostat is the difference between a healthy, happy, live collection, and a stressed, sick, dead collection!! You have to think, if a thermostat malfunctions, and you do not notice, or are not around, you could loose your entire collection, not worth the risk for me to save a little money! Just my 2 cents though!