I hate add-on wind deflectors. There's a built-in deflector that pops up when you open the roof -- that should work fine, IMO. Be sure to open the rear windows just a crack to avoid pulsations when the roof is open.
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2014 535i Individual | Azurite Black/Amaro Brown Merino | Premium | Cold | PDC | Rear Camera | Anthracite Hdr
Prior: 2011 535i AT | Black Sapphire/Cinnamon | Premium | Heated Sts | Nav | Sirius | Anthracite Hdr & Trim
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Prior: 2005 330i 6MT | Black Sapphire/Sand Leather | Premium | Cold | UGO | OEM Alarm