I've been using Hydrofarms for my corns who are much more tolerant of varying temps than balls seem to be. Now that I've got a ball, I have her currently on a Hydrofarm (separate from my corn rack) and though it's doing the job, I'm looking at investing in a higher end thermostat since I'm going to be getting more balls in the next year or so. I've been looking at a number of options and though I'm leaning towards the Herpstat 1, I'd also like opinions/experience with others. The Vivarium Electronics variety looks nice though I'd prefer a dimming style if possible. These will be used in melamine racks with 3" and 11" flexwatt (obviously 1 thermostat per rack/size).