I have to agree! I don't have a rack of balls, I have one he is a mojave and his worth is much more than a dollar value. I care about him and after using a 500r zoo med the temps, at the pad contact, would zoom up to over 100 degrees then it would shut off. I spent a few days worried he would get burned and ordered a proportional (herpstat) and only regret the zoo med a waste of money. Buy a proportional where you set the temp you want and presto that is the temp you get. None of the set the temp you want (trial and error) and get that as an average temp. With spikes or over 10 degrees!