If you got some money to blow, theres the Diamondback HD.
Dale D who drives a Dodge pickup truck says:
The Undercover Tonneau Cover quality is top of the line. The cover fit my 2014 Dodge [pickup truck] perfectly. It took me between 30 minutes to an hour to install. I could have installed quicker, but a friend was there distracting me. The black color looks great with the silver color of my [truck]. Quick delivery. The delivery man called and met me at my house. He was extremely nice and helpful in moving the large package to the garage. A++++ company.
While old school fiberglass tonneau covers looked cool and reduced wind resistance, ...
Had 3 trucks now with a tonneau. Never have I noticed any improvement in MPG. Not even a little bit.
Cool looks is subjective as well.
Didn't Mythbusters do something on this?
The MPG part, not the looking cool part.
This does not allow full use of the bed, the hinges and braces are still in place