I really do wish that the Simplicity/Riccar full-size power nozzle were quieter. But check out that brush roll! You know that has to clean amazingly.  The same power nozzle on the S36/1700/Moxie/Impeccable comes with a wood brush roll.  One local Simplicity dealer told me that the wood roll makes the nozzle quieter, so he would take the metal rolls out of the TOL models and replace them with the wood rolls from the lesser model because the TOL would sell better to women who simply preferred the quieter operation.   I was scandalized but then gratefully accepted a metal roll to put into my S36 that I had at the time...