I can't refute anything said here, but when it comes to screens, the discussion always relates to differences in construction and how that might impact the sound of one screen against another. I have no doubt that screens impact sound vs. no screen, but I've been reading ts.com for I think ten years now and I have yet to see a real convincing technical article on the impact of one screen over another based purely on sonics. Not saying it doesn't exist, just saying that it seems like the data isn't there.
For my own taping purposes, I have a hard time seeing how, for example, the plastic ribbing inside of a BD5 is going to affect the sound or imaging of a recording made from the audience at a concert venue that comes inherent with sonic imperfection. Maybe if you used screens in a studio then there might be a sonic impact, but why do you need a screen in a studio? I just think, for most people reading this, the discussion about screen differences is theoretical and would never be able to be heard on a live music recording.
Anyway, the bottom line for me is, does it cut the wind noise. If it does, then the screen is worthy. If not, move on to something else.