I installed these about a year ago on a 2011 WRX. The aluminum housings are rigid and strong. I was able to easily rout the wire under body panels and attach the long side rails with Rare Earth magnets under the chassis. Using magnets eliminated the need to drill holes and hold really well. They actually hold so well you need to use a tool to get them off. This was a much better solution than using the "tape" style LED's sold by others. I have seen too many of these style lights fall off in the Florida heat. Here is a link to the magnets I used: https://amzn.to/3syoWG8 . I sourced stainless hardware locally to attach the LED's to the magnets using the tabs on the end of the LEDs. I also added 2 magnets to the middle area of each side using the included clips and zip ties. This put 4 100lb magnets on each side LED so they are going nowhere. If you do this I would recommend removing as much of the undercoating as you can where the magnets is but be careful not to damage the paint.
Overall the brightness is great! I had read on other products that some people installed two sets of lights, this was not needed with these.
The app works very well on my Apple phone and is easy to navigate. I plan to purchase an interior set since you can link them in the app and sync the color. The control unit is mounted in an enclosure under the hood next to the fuse box. I can connect to it from about 35' away with no issues.
One thing to note, I wired these to an "always on" power source so they can be run while it's parked for car meets at night. I have forgotten to turn these off several times at the end of the night and found that they draw so little power it did not drain the battery overnight.