I'm about to pull the trigger to order this
http://www.madstad.com/s.nl/it.A/id.2518/.f

Roboknob System Complete - Honda Goldwing F6B with 13" Light Gray Shield


but have a couple questions that maybe someone who has this setup can answer??

Do I need my stock windshield or does this replace it?
I have a 17inch honda tall now and can see through it by about 3 inches. I can look over it with a stretch but not the ideal setup in the rain. I'm thinking the 13" will be ok even though I'm 6' 1" ??

thanks