Best aftermarket accessory I have ever purchased. I hate how much this thing cost but it was well worth it. Installation was extremely easy, I now have secure bed storage, it looks awesome, keeps my stuff dry (for the most part), and I have seen a slight increase in fuel economy (1 mpg?).
I did not want to route the drain tubes down to those plastic knockouts at the front of the bed because I knew they would waste space and get damaged when I carry cargo up there. I drilled appropriate size holes in the corners of the bed, painted the bare metal, and installed rubber grommets for the drain tubes to pass through. Pictures attached.
In a real downpour quite a bit of water gets past the seals and in around the edges of the tailgate but i think you just have to remember -- it is still a truck bed, not a car trunk. Other attached pictures show what it looked like inside after a flash flood warning rainfall.
Totally satisfied with the purchase, only wish I had bought it sooner.

This is definitely water tight and looks clean. However the bigger issue is I feel like I am constantly having to adjust The cover because it seems to go sideways. About every week or so I feel like I have to roll it back and tighten up the four wing nut styles screws. It can be a pain to get the last foot to lay flat completely sometimes.

It was on my door step two days after I placed my order I would recommend watching a You Tube video on how to install this it made the directions very easy to understand . I had it installed in 45 min. Looks very good on my 2019 Frontier I have the gun metal grey and the Black Tonneau cover looks good on it . It is much more secure than my old cover All of my friends like it But they all thought the cost was a bit high.

Just installed the BakFlip G2 cover on my 2010 Nissan Frontier. The installation was fairly straightforward. It took me about 40 minutes, and only required a 15mm socket and ratchet to tighten the clamps. No other tools were needed. The installation instructions are basically a pamphlet with tiny pictures. They could be a lot better. The first step says "Attach the rails to your truck using the provided clamps." Having never installed one, I had to figure out which direction the rails go, where the clamps should be placed, etc. by trial and error. Probably installing another one of these would take me 15 minutes or less to do. For anyone interested, the end of the rail with the silver bracket needs to be near the cabin of the truck.

If you have a Nissan Frontier with the Utili-track system, the clamps will fit between the track and the top of the bed if you sneak them in at the end of the rail and slide them down to the correct position. Once the rails are installed, you won't be able to slide your bed extender past the clamps, so it's pretty much stuck where it is. This isn't too bad, since you can still use the bed extender in the position where it fits on the tailgate, but you will need to remove it to use the cover. The cover comes with 2 hoses that should be used to take water from two drainage points to some sort of outlet on your truck. The Frontier has 2 rubber plugs that you would need to remove or modify to get the water to drain out. Right now I'm just letting the water into the truck bed.

The cover seems pretty solid. The panels have a metal skin over a styrofoam core. Each panel can be unlatched by pulling a cable to release the latch, and then it can be folded up. The instructions recommend holding it in place using the attached D-ring clips and 2 bungee cords (not included). If you fold it all the way up, there are 2 struts that attach to it to hold it up against your truck cabin. They included some rubber strips with adhesive backing that I used as a bumper to keep the folded up cover from smacking into my rear window.

Once installed, it fits well and looks nice. I didn't hear any whistling or anything on the highway, up to speeds of about 80 mph. There is a warning label that says to always close the tailgate before latching the last panel into place to prevent damage. Unfortunately, you can't see this label if you just open the tailgate and try to re-close it. I would warn anyone you let borrow your truck about that.

I'll update this if anything changes, or if my gas mileage improves or anything exciting like that.

I'm not sure this tonneau cover is appreciably better than it's cheaper competitors, though overall I'm happy with it. I didn't like that the under side rails don't terminate with solid stops at the cab end since mine leaked as the flimsy rubber strips couldn't contact the bed end tightly or it would have created issues with the overall fit on my '21 Nissan Frontier. I had to fill the ends with silicone as well as the corner pieces which also leaked. That done, its relatively watertight and adds to the functionality of my truck. I've had it on a year and am glad I made this purchase, just be prepared that you might need to silicone water entry points which I did not expect for a product that costs twice as much as some of it's competitors.