Mav hope to see you at wang, as for fod screens yes and no, firstly a fod screen does not stop dirt or sand so if you are flying off a dry field a fod screen may not help you.
they will stop grass, stones, etc also they reduce your airspeed I have noticed a signifigant change in airspeed on my 16 in other words they restrict the airflow to the turbine decreasing performance.
Now to jusify myself I have a mate who has the same 16 with the same engine and both at the same rpm etc I had a fod screen he did not his went faster than mine but I chewed more fuel when I removed the fod screen the performance was the same.
Fod screens do serve there purpose and at the end of the day if you have a mishap and the fod screen is full of dirt are you going to restart the turbine before you check it its the same when you dont have one you know you have just had a bad landing are you going to again start the engine, simple I think.

Todd