Well they are good for an intermediate pilot but if you wanna go from trainer to P-51 or to an airplane with flaps good luck!

I would suggest getting a SIG 4*40, or GP Sportster and get the hang of that... low wing, then low wing taildragger etc.

Going from a trainer to a P-51 can and has been done, but yo would be in the minority if you did it successfully---

Keep us posted,
james