Very effective in the winter (and summer) when you are in precipitation
Not sure you meant to say that, SB
Precipitation above 0C is just fine; precipitation below 0C is
freezing rain which is potentially quite nasty and I am not sure TKS would cope with it too well.
Also, with the full TKS system, isn't there a "standby" setting which you are supposed to use when flying below 0C? This is to prevent the tiny holes getting blocked up. With a prop-only TKS this isn't much of an issue because the dispenser tubes are about 3mm diameter.