We have been using a big apple thermo for a while and the only real problem we have with it is the night time drop. It takes a while to get the temps ajusted and the slightest movement messes it all up. We have also had a problem with the fuses in it, they dont seem to last very long even when you dont have much wattage running on them. I wiuld say spend the xtra get the best, get a helix system

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