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When driving at higher speeds (to pass other vehicles), the cab seems to pressure and force it open, causing wind noise (2005 F350 KR). If you pull the cover closed, the noise stops. I have not had an opportunity to take to the dealer yet (service manager says may need adjusting). I had one in my 2003 and had no problems.
To early for me to tell. I hit mine hard with water to look for leaks, didn't find any. I'm not having any pressure issues. Driving at high speeds though I thought about one of the air deflectors but with cab lights there isn't enough room.