:scooter: embalmer, in answer to your question, yes the windshield helps. Keeps bugs off you to some extent..but then you have the problem of wind shear or turbulence( spelling), depending on set up of windshield....need to adjust for your height...on high wind days they can sometimes be a pain..especially when a semi passes you at 75 mph..on average, I really appreceiate my screen though ...is a lot of protection.... :roll:

as far as size ,, I am not experienced enough to answer, some of the others here will give you the answers....