I see Jorgen thinks you are in SD so you may have already talked to him, if you are a tiny bit further North of SD, come by and see mine anytime. A few people have taken me up on my offer over the years already, but warning right now the shop is a mess as I am doing woodwork on the car right now (old car wood framed body).
Biggest issue is you can't weld or plasma cut on top of them or you will melt them, can show you that damage too

And yes you have to be a little more careful when dragging heavy metal objects with sharp corners because you are too lazy to get out the engine hoist, but after all these years my floor stills cleans up really nice and I love it.