I have the Honda touring screen (I think - it was on there when I bought it) with the PUIG flip thing on the top.
Raised or lowered, I have absolutely no trouble riding with the engine flat out. To be honest, it's so calm that I could probably read a book.
I'm 5 foot 11 and it's just as good with both the low and std seats.
I put the touring screen into the lower position as it makes seeing the road easier on foggy nights (the screen's go opaque very quickly in fog)