Winshield vent

[Pitchinguy]

Made some larger lowers that are really working well. Buffeting is completely gone now. It's great for this time of year but I'm wondering about hot weather & this has got me thinking about a winshield vent. Anybody installed one per Gadget's page? http://www.gadgetjq.com/lj_windshield_vent.htm

I've never ridden a bike w/a winshield vent. Do they flow alot of air? If anyone has done this, would you do it again? Does it flow enough air to make it worthwhile? Pros/cons etc?