I've used a mat for the last four or five years with great results EXCEPT for the first year when I cooked my little seedlings because I didn't prop up the plastic dome for ventilation. My mats do not have a thermostat or timer.
Remember, you can put your cherry seeds in a few days later than most. Mine always seem to be the first one's up and the fastest growing sprout. They'll get leggy quick.
Greg
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