Personally, if I have the Airflow high enough that I can ride with my visor up, the head buffeting is bad enough to give me a slight headache after a couple of hours. I've swapped the mirrors and tried spacing out the screen mounts, but still the same.
On the other hand, I now have it set in such a way that I can ride with the visor cracked open slightly for more air at speeds of up to maybe 40mph and I don't get any buffeting. And I couldn't do that with the stock screen.
So... do I regret buying it? Hmm... I don't know. It didn't do what I hoped it would do for me, but it has improved my riding comfort a little due to being able to ride with visor cracked open in hot weather.
That's a tough one. I probably wouldn't buy it if I had my time again, but I like it enough to keep it and not resell it.