This system was so easy for me to install. If you follow the instructions and read the accompanying notes you will have a smooth installation. I put this on my 2012 Prius and had to adjust the length between the 2 front Q99 clips to 43" in order for the clips to be secure. The guide recommends 42", however, I read the notes and increased the length gradually until the clips were balanced correctly. Once set on the roof I marked the places were the clips sat with a sharpie, took it off the roof and reinstalled it at the marked place with no problems. It is so easy.
I also took it for a test ride to see if it would come loose or if there were any other concerns. It was secure after 20 miles, however, I would not recommend leaving it on as the noise it made from the wind resistance was LOUD!!!
I use it it transport 2 kayaks primarily within a 50 mile radius of my home and it works great. I highly recommend this rack system.
2012 Toyota Prius