We have sliding doors from our living room out onto a back deck and we like to have those doors open during the warm months to let a breeze pass through. Since getting cats last fall, we've had to keep the doors shut because the retractable screen doesn't keep them safely inside. We bought the "Complete Wall Net with F-Zipper" plus a bunch of DIY install gear to create a netting wall around the top of the stairs from the deck down to the back yard. Our cats can now freely roam the back deck, and we get to have a breeze through the house. The cats love their newfound freedom, we love the fresh air, and the built-in zipper door has already served its purpose, too.
Install was pretty easy. It took about 8-10 hours across a couple of days, but I made a few mistakes along the way that took extra time to correct.
All in all, we're super happy.