Back in '76 I made All-State running the carpets. Only played on 4 grass fields.
The old stuff was fast, but it sucked. Getting tackled on it was horrible. and the carpet burns were worse than
chasing WT around the living room.
The new stuff is better. The most annoying part is the little ground up pieces of rubber get in everything.
The studies are showing that the grass does not give as much as grass and causes more knee injuries, but I'm not sure how much more. Nothing is as good as grass. Jordan-hare is one of the most beautiful fields in the world. But keep in mind, it does not get as much use as a high school field.
And the new stuff handles rain better than most grass fields.