BakFlip MX4 vs Undercover UltraFlex

[Kansas Mavs]

Does anyone have any experience with or recommendation on BakFlip MX4 vs Undercover UltraFlex?

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[Lou'sBluMav]

I am also interested in this comparison. It seems the Undercover may have a slight avantage in the full open position in that it is held by the prop rods and not against the back window. Any comments on the weather sealing?