I recently purchased the Undercover Flex tonneau cover and here are some photos and my review - installed on a 2012 double cab 5' bed: I purchased it from 4Wheelonline and received the cover in seven days, no issues with 4Wheelonline folks. The package was shipped via UPS and the picture below shows the box. The second photo show what I saw when I opened it. The cover and all parts were there and no damage but it was obvious that the packing material, plastic air wrap, was deflated and there was not enough to support the cover.
Installation was not difficult but there were a few minor issues; a) the instruction sheet stated to use 9/16" wrench but the bolts were 1/2", b) there was no steps in the instruction to explain what to do with the roll of rubber seal/weatherstrip (I had watched installation videos of other brands of tonneau covers so I new where it went) - it sticks on the top of the bed next to the back window, c) one of the latches would not latch (left side, latch one up from tail gate) and after many adjustmenst of the rail I still couldn't get the latch to work. So the simple fix (should have done this at first and saved a lot of time) I unscrewed the latch from the cover/latch mount and placed two small flat washers between the latch and the latch mount. This solved the problem and the latch works like a dream. I ended up doing this to another latch that was a little difficult to latch. d) the ends of the rails where they meet the tail gate needs to be filed down so the tail gate would close/latch. This was no big deal, I made sure the rails were pushed forward all the way but still needed to do some filing to get the gate to shut.
Summary: the cover is built well, operates nicely as advertized, looks good (it was raining and cold and truck is dirty - Seattle weather), I would purchase it again and recommend it. Just be prepared to do some adjusting to the latchs (maybe it was my rail installation that cause the latch problem but I did adjust the rails many times to try and solve this problem). Really the only big issue was my initial shock when I opened the box and saw packing material not supporting/protecting the cover. I thought for sure there would be some damage. But NO damage, I guess that speaks to the strong construction of the fiberglass panels. I'll be sending a letter to Undercover to tell them about this, hate to see such a great product get bad reviews just because it was not packages correctly.
Agian, yes I recommend this cover and would purchase it again.