Yeah, it's ok, I would even say very well, i love to play there.
There the player is learning how to fold and so on...
No big difrence from the "real money" - the fellas from big stakes playng monsterly (if I underestimate them, I take the damage). Everything is there... (one exception only; you cannot withdraw the money you have won.) the fish, the donks, the sharks, the nits, the bluffers, everything... the bad beats, the all in's preflop...(I've made visual comparisons between real and non-real money play: in real money I've seen A5o all-in before the flop for example, strange things happen there.)
It is good place for practice. In my opinion, if someone can't play there, he won't be able to play for real money either. (nothing personal 🙏)
I used to play for real money (cash table), but there came a point, where I realized I just wasn't ready.