I like them also on my 1100.
I did not notice any increase in engine temp with them but a whole lot of increase in comfort on hot days.
It is not an aircooled engine relieing on air flow over the motor,and the same amount of air still flows through the radiator,passed the motor and down out the bottom.
I have been stuck in almost 100 degree heat in stopped traffic going through charlotte and still had no engine heat trouble,the have been on almost four years now.