Unless you're Karen, works perfectly...
I'm in disbelief at the number of people reviewing this product who appear to turn the shower on and start lathering themselves up before they've selected a comfortable temperature! Why in the world you would want to change the temperature mid shower with soapy hands... And if you did for any reason, you're in a shower and have been in a shower at the wrong temperature for some time already at this point, why not take an extra second to wash the suds off your hands before adjusting the temperature?