It only takes 108 degrees to to give a BP brain damage. The zoomed UTH's can get the floor of a glass tank that hot in a few hours.
When a UTH is unregulated and does't have any airflow over it they will keep on getting hotter and hotter. I've measured the floor of a 10 gallon glass tank with an appropriately sized zoomed UTH at 147 degrees F. It took less than a week to get that hot.
I personally don't use them but 99% of new owners who get a UTH do and chances are they aren't using a thermostat. That is why I did my "worst case" test to see what happens.
I use AP cages with flexwatt. I can't use anything like ultratherms because they don't get hot enough to heat through the 1/2" PVC floor. But for glass tanks/single tubs I would use and recommend something like an untratherm.
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