We have a small patch that I installed under the kid's sand box.
I'm not a fan it's better than the cheesy 1970s patio "grass" outdoor carpet, but only marginally.
Major complaints, it gets hot, even though it's shaded, it still heats up, much like concrete. It's semi-permeable, water will soak through, but sand, little leaves, etc, get down in it and compact. Raking on it is a fantasy. Leaf blowing is a waste of time for anyone at isnt on the surface. Traffic will mat it and it really looks plastic when matted down. It's much like having shag carpet with junk ground in. And the biggy, it feels like cr*p underfoot. Concrete and pavers feels like concrete and pavers. Wood chip mulch feels like mulch. Grass feels like grass. Artificial turf, feels like a walking on a plastic bag with grit in it with the added bonus of your feet get dirtier than pavers or good healthy real turf.
Hate the stuff. It should be the winner of things that sound good but aren't award.
I'm thinking of pulling it out and replacing with playground mulch.