Prior setting up the fence in our backyard, we had a small screened in catio just on the deck. Our cats loved being outside, but it was hard for us to be outside with them. If we were out in the yard, they'd be constantly meowing at us to let them join them and getting in and out of the catio ourselves was awkward and cramped.
Now that our fence is setup, they have access to most of our backyard. The cats can roam into the grass, laze on the deck, or join us on our porch swing. They love sunbathing out there, sniffing the plants, and stalking birds. One of our more anxious cats is way more calm now that she has room to roam. It's wonderful to watch them have their zoomies in the grass, or pouncing on moths, and I spend way more time outside than I ever did before setting it up. Coming home from work, one or two of them will greet me ready to be pet. I feel like we have dramatically increased their quality of life and mental enrichment.