I have 1 herpstat intro paid 109.00 love it its a proportional thermostat and what i love the most over the 2 zoomeds i own is the alarm that goes off if the temp goes over or under the range i set it for. Don't get me wrong the 60.00 zoomeds work great but the herpstat gives more piece of mind that the uth is working correctly.I am slowly switching all my tanks to herpstats as finances allow.