I highly recommend the Bosch Micro Edge Excels!!! Nothing does compare.
BTW - My dad doesn't work there either...
Do you ever clean your wiper blades? Loud blades are normally dirty blades (rubber) or winshield loaded with road grime (do a real window cleaning not the normal wipe and go most people do)
Do you have the Bosch Excels or just the normal bosch? (normals are no where near the excels!)