Regardless of what the old poster put about the bad customer service Undercover had, I think they are great. I'm from Missouri, so I may be a little biased (they're made in Missouri) but I ordered one for my dad's Platinum and I don't see what the problem is. The store I looked at said Bakflip has never been good with service so they dropped them completely.
Dad's isn't installed yet, but they had one on display and it was impressive how they innovated a lot of little things that made it better than the Bakflip F1. For example, you have to use a bungie chord to strap down the flaps on the F1, but the Flex has buckles at every section to snap on. Also, the Flex doesn't lean up against the cab of the truck, where as the F1 does and could cause paint damage over time.
My 2 cents.. I'll try to remember to post pictures of the install on his truck.