I've had (4) Hydrofarm thermostats for the last three years and never had any issues. They're inexpensive but they've been very reliable. I'm only looking into the herpstat 4 now because I'm upgrading (4) enclosures and
want one unit to control them all. For the price and quality you can't beat the hydrofarms.

http://www.amazon.com/Hydrofarm-MTPR...arm+thermostat