RF Pro is 300% a Pro Staff. RF97A Pro Staff to be even more precise, reworked and modernized. It plays almost identically, spins, depth, ball trajectories, power, everything. Stiff and massive throat, a lot of weight in the handle, leather grip even, high stiffness both frontal and torsional, mid/upper hoop too - super easy to pick up a low junk ball - just like RF97A, or drive down a high ball, responsive, very high power levels, generous spin and dip, easy depth and blocking, and identical trajectories, very slightly lower
Calling RF 01 Pro inconsistent or lacking feel is a total fail, IMO. Dunno what your level of tennis is, but yeah, no. The exact opposite methinks.
I found it super easy to hit super consistently practically from the 1st ball, power hitting through the middle, just holding 20+ balls with total ease. That's actually what we all remarked on. Feel is spot on, better than RF97A, which had a bit of a metallic stiff ping coming from the throat or bridge, especially noticeable on volleys, and also had a tiny bit of ringing after a shot, could tire the arm slightly more because of that
The one meaningful difference is that it's kind of between 6.0 and 6.1. If 6.0 is a total attack racquet, like RF97A or the current PS97 v14, think Federer, or Alcaraz, or Kyrgios etc, forehand starts with tip of the racquet forward, light tip of the racquet, point and shoot attack. Can do defending and grinding but really not ideal for that. Difficult to imagine Bautista Agut consistent holding style with it, or Delpo's, he could also hold balls eternally, etc
RF 01 Pro is slightly less "attack only" than RF97A or PS97 v14, is easier to hold and move balls around with, reminds of some PS90s in that sense, works fine with lower tension or looser older strings. Still not ideal for that RBA Spanish consistent style, with frontal neutral stance and forehand off the outer leg, without the full drive through. So I'd say between 6.0 and 6.1, but leaning toward 6.0, you have to step into the ball nicely with it and swing through