Windscreen Change?

I'm thinking about getting a new windscreen for the F4i. On a budget though. So I'm wondering if it's worth it.

How much diff do you really get stock versus...double bubble or race screen?

I know it's been a while since you posted this but I have a double bubble and it helps a little. The wind hits me in the head now instead of the chest. But on a good side tucking under it is much easier. It;s not a strong pounding wind and you get used to it. Would I change back to the stock one? No.