I do not know about the others, but the Reptile Basics rack come with the flexwatt already set up. All you have to do is take it out of the box and tweak the thermostat and thermostat probe placement to get the temperature you need. With the Reptile Basics rack and pretty much all racks I think you have to order the thermostat separate (it is not included with the rack). I use a ranco thermostat, also purchased from Reptile Basics, on mine.