The Undercover Flex is better than Bakflips because:
1. Bakflip leans against the cab, Flex stand vertically (does not lean on cab).
2. You have to buy and use bungee cords when you fold open the Bakflip. The Flex comes with attached straps.
3. The Flex costs less than the Bakflip F1 and Bakflip Fibermax.
Other info: The Flex, F1, and Fibermax all have FRP top panels. The Flex is rated at 400 lbs distributed weight. The F1 is rated at 500 lbs and the Fibermax is rated at 400 lbs. Warranty: Flex-3 yrs, F1-3 yrs, Fibermax-2 yrs. Both Undercover and Bak Industries are now owned by the same parent company.
....and no, I don't work for any of the companies mentioned.