In terms of pure hardware it's a very impressive piece of tech. It's quite amazing they managed to put that much raw power in such a tiny box.
In terms of potential, I think they really did the right thing by putting more RAM into it compared to the One, it will allow for games to have actual and visible improvements and not just a higher resolution, which is the thing that (imho) really keeps the PS4 Pro from its full potential.
But as usual, it's all about the games. And on that front MS has a lot to prove nowadays...