The temperature sensor is not the ASIC chips, if the temp sensor is at 100C then your ASIC chips can be around 150C and most of your other components like capacitors and resistors, its strains all compontents and they will fail prematurely.
I really don't understand why you would run them at 100C and assume its perfectly ok.
I don't/haven't ran them at 100C continuously. Again, this was a brief test to prove they hash and at what speeds.
I just moved the units to ensure clear air flow and have the air conditioner on. In 40 minutes or so I'll take another temperature reading (along with hash rate).