I just bought the tall givi for my x250 09 a few weeks ago. I really haven't ridden it much since, but I can see the screen makes a big difference. This is the screen that is so tall that you actually look through it, and it is clear acrylic. People that don't like to look through it have trimmed it down. the trick would be to trim just enough to look over it, yet still get the wind shielding.
As it is now, I no longer have to put my helmet screen down, and the ride is much quieter without all of the wind buffeting. It is much more relaxing. Long term, I don't know what I will think or if I will miss all the wind. I think I will like and prefer the Givi. It is easy enough to switch the screens out to go back and forth I suppose.
I did notice a slight drop in speed at given rpms, but not much, certainly not enough to worry about. If you google givi windscreens Kymco I am sure several retailers will pop up.