Is a plastic grind machine a good learning yoyo?
Yes.
If you know how to bind it’s great.
The PGM is a good everything yo-yo. As has been said, you’re going to need to know how to bind. Once you do, there is nothing that the PGM can’t do. Period.
Except make a good cup of tea. In all seriousness yes a very good yoyo all round.