Thought I would wait for six months after purchase to do a review on my Extang Solid Fold Tonneau Cover to see if it was really a good purchase. I did a lot of research while still overseas on what I wanted to do with my DCLB before purchase in August 2012. A low-profile, hard tonneau cover was a certainty. It is not uncommon for me to travel across the US and I was looking for something with a low-profile, easy to remove, weatherproof, and provided security. Some of the low profiles had a wire latch in the rear that takes a hangar and literally minutes to open and remove. Not for me. It came down to the Fold-A-Cover G4 Elite and the Extang Solid Fold. They G4 provided better security with locking mechanisms in the front and rear and provided more bed space when secured open. The drawback was the removal process wasn't simple. It takes several minutes to remove and once the rails are in place you don't want to remove them. The Extang met all my criteria. The cheapest price I found online was with Truck Alterations. I called, ordered, and installed within a few days. I also ordered a Pop & Lock which Luke installed when I went to pickup the cover. If you don't get this with virtually any tonneau, the bed will still let down and leave your stuff unsecure. I do not know if the G4 requires this.
As you can see, the Extang is low profile. This is a big plus for me. I had a camper cover on my last Tacoma and didn't want that any longer.
There are no keys to secure the cover, but there are clamps at the front and rear of the cover. The clamps fit directly onto the rails. The front clamps are secured by easily screwing a handle. After initial install I bought five washers for each of the front clamps so it wouldn't take so long to secure (although it only takes approx 1 minute anyway). The rear clamps are spring loaded and a bit more difficult as the require you to pull and push to seed them onto the rail. I didn't mind this since the tighter the spring, the more difficult it would be to get into the bed of the truck.
After a few days and a washing, I realized there were gaps in the Extang and the bed. I put down weather stripping along the bed closest to the cab. There were still gaps, so I put another two inch piece of weather stripping in the front inside corners near the cab. Six months later, the cover is actually more waterproof than it was when I first bought it. Water does not come in at all when it rains and only a few drops when washing with a heavy spray. This has been better than I ever expected.
A big issue for many is whether you can use rails or not with the cover installed. You can use the rails except for where the clamps secure. I took a picture of a bed cleat to show they would fit. The front rail can be used in total since there are no clamps next to the cab.
Even when secured, the Extang can be folded open and secured to two clamps next to the cab. This allows use of approx 2/3 of the bed. This was a negative for me in comparison to the G4 that allows use of most of the bed. The positive is the cover doesn't block the field of view when secured open.
The Extang is lightweight and literally takes 2-3 minutes to install/uninstall with only one person. There are no additional rails. What you see, is what comes with it.