I have the said editions.
Fingering wise, I find some of them downright over-complicated. In most cases I can see why they have been suggested and how they would facilitate a better performance. I suppose to Arrau, great pianist that he was, they weren't that complicated? They were clearly based on his own personal fingerings rather than the most logical/obvious ones.
He also adds many of his own suggestions, for example I remember in the 2nd mvt of the Appassionata he adds tenutos over some inner voices that are not Beethoven's own. Traditionalists would have a heart attack to see this (my teacher told me to absolutely not do them in any circumstance). Also pedal-wise- Arrau was a romantic and played everything as such, his pedallings are again based on his own ideas rather than how one should academically pedal Beethoven.
That is my overview.